Bump CPS version to 3.1.5-SNAPSHOT

- Bumped the version to 3.1.5-snapshot and updated the version
  properties file

Issue-ID: CPS-1325
Change-Id: I61848166b94a5ce14651f2d0fe42e4cc39f5c5e2
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
19 files changed