fix GEARPUMP-155, integration test failure

[manuzhang]

Changes include:

1. fix integration test
2. DistShellAppMaster and DistServiceAppMaster send ActivateAppMaster(appId) message to master when all the executor systems have been launched
3. fix warning

[codecov-io]

Current coverage is 65.56%

Merging #36 into master will increase coverage by 1.21%

1. 7 files (not in diff) in ...apache/gearpump/util were modified. more
   • Misses -6
   • Hits +6
2. 2 files (not in diff) in ...rpump/cluster/client were modified. more
   • Misses -43
   • Hits +43
3. 5 files (not in diff) in ...che/gearpump/cluster were modified. more
   • Misses -20
   • Hits +20
4. File ...ntStoreFactory.scala (not in diff) was modified. more
   • Misses -2
   • Partials 0
   • Hits +2
5. File ...cutor/Executor.scala (not in diff) was modified. more
   • Misses -1
   • Partials 0
   • Hits +1

@@             master        #36   diff @@
==========================================
  Files           178        178          
  Lines          5922       5924     +2   
  Methods        5644       5645     +1   
  Messages          0          0          
  Branches        278        279     +1   
==========================================
+ Hits           3811       3884    +73   
+ Misses         2111       2040    -71   
  Partials          0          0          

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[huafengw]

+1