Fix processing speed in eventhubs-streamanalytics-cosmosdb

[algattik]

OutgoingMessages should keep up with IncomingMessages (600k per minute)

cd eventhubs-streamanalytics-cosmosdb
./create-solution.sh -d myrg -t 10 -l northeurope
[...]
starting to monitor locusts for 20 seconds... 
locust is sending 872 messages/sec
locust is sending 1621 messages/sec
locust is sending 2697.375 messages/sec
locust is sending 3455.9 messages/sec
locust is sending 5471.5 messages/sec
locust is sending 6810.2 messages/sec
locust is sending 7971.5 messages/sec
locust is sending 9053 messages/sec
locust is sending 9561.8 messages/sec
locust is sending 9753.8 messages/sec
monitoring done
locust monitor available at: http://52.155.179.29:8089

***** [M] Starting METRICS reporting
Event Hub capacity: 12 throughput units (this determines MAX VALUE below).
Reporting aggregate metrics per minute, offset by 1 minute, for 30 minutes.
                                IncomingMessages       IncomingBytes    OutgoingMessages       OutgoingBytes   ThrottledRequests
                                ----------------       -------------    ----------------       -------------  ------------------
                   MAX VALUE              720000           720000000             2949120          1440000000                   -
                                ----------------       -------------    ----------------       -------------  ------------------
    2019-07-08T08:41:51+0200                   0                   0                   0                   0                   0
    2019-07-08T08:42:00+0200                   0                   0                   0                   0                   0
    2019-07-08T08:43:00+0200               53900            53219651               49959            49327981                   0
    2019-07-08T08:44:00+0200              515056           508587368              496420           490177954                   0
    2019-07-08T08:45:00+0200              598890           591349724              578479           571203437                   0
    2019-07-08T08:46:00+0200              600572           593017681              561561           554499015                   0
    2019-07-08T08:47:00+0200              597500           589985683              563482           556393599                   0
    2019-07-08T08:48:00+0200              600960           593408050              513331           506880384                   0
    2019-07-08T08:49:00+0200              601521           593959016              593205           585749886                   0
    2019-07-08T08:50:00+0200              601282           593717804              500150           493861481                   0
    2019-07-08T08:51:00+0200              604751           597149192              514832           508366889                   0
    2019-07-08T08:52:00+0200              608397           600748827              472418           466475537                   0
    2019-07-08T08:53:00+0200              606160           598535776              474963           468996517                   0
    2019-07-08T08:54:00+0200              607886           600239871              477438           471441458                   0
    2019-07-08T08:55:00+0200              605485           597875502              471086           465163684                   0
    2019-07-08T08:56:00+0200              608527           600871623              524951           518354312                   0
    2019-07-08T08:57:00+0200              607039           599406517              399120           394100780                   0
    2019-07-08T08:58:00+0200              607360           599739819              471705           465777118                   0
    2019-07-08T08:59:00+0200              607220           599573247              450127           444471194                   0
    2019-07-08T09:00:00+0200              609149           601490846              452120           446435778                   0
    2019-07-08T09:01:00+0200              609889           602221035              480420           474384460                   0
    2019-07-08T09:02:00+0200              608722           601070463              416933           411690081                   0
    2019-07-08T09:03:00+0200              603686           596098118              473337           467389152                   0
    2019-07-08T09:04:00+0200              590519           583094755              444143           438559398                   0
    2019-07-08T09:05:00+0200              600124           592579242              426720           421356704                   0
    2019-07-08T09:06:00+0200              606179           598555994              461778           455984029                   0
    2019-07-08T09:07:00+0200              601860           594294746              428422           423034922                   0
    2019-07-08T09:08:00+0200              603490           595902290              474911           468950668                   0
    2019-07-08T09:09:00+0200              602521           594955778              481977           475913196                   0
    2019-07-08T09:10:00+0200              604696           597083899              385932           381093727                   0

***** Done