Bump version number to v7.1.2
Bump version number to v7.1.2

Change-Id: Ic807c2e4bd4ccc3c1c07fd836592c36c876c4b51
Reviewed-on: http://review.couchbase.org/96100
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/gocbcore