Renamed file 70-trove to 70-trove.sh

Reason: Devstack not installing trove
        stack.sh ignores the trove installation script(70-trove)

Change-Id: I3f179a6b5ded46e9f96a1c4bcc673ec52fa8bf0e
Closes-Bug: #1274022
Merge "Renamed file 70-trove to 70-trove.sh"