Creates TROVE_LOGDIR, if it does not exist

Reasons:
- report/logs directory is not available in trove-integration code.
- trove services api, conductor and takmanager are not generating any logs.

Changes:
- Added conditional directory creation in absence of TROVE_LOGDIR.

Change-Id: I117c53bb860ee656c988122e099401ac7f3056ef
Closes-Bug: #1266517