It seems we provide (and projects use) the provided decorator
'synchronized_with_prefix' but we don't provide an equivalent function
to complement that function to clean up its created lock files.
Providing a complementary method seems pretty useful for projects
that actually clean up these lock files (if any actually do in the
first place).
Change-Id: I601ce3992411e6a2ddded13aba4ac068cf8f14e2
68d941b5ea