Handle service creation race by service workers

This handle a race where a sibling has already created the service
record in the database.  This fix is similar to that of commit
f6c341b4.

Change-Id: I7975fc632eee34390c5d7dc275b52363ad45475e
Closes-bug: 1326901
(cherry picked from commit 37247aba813fbc408901a2f1b1ad88e2acb796a1)
Merge "Handle service creation race by service workers" into stable/icehouse