removing Snapshot for hub release #1517

Job	Run time
build (mssql-plugin)	1h 23m 46s
build (postgresql-plugin)	36m 57s
build (mysql-plugin)	1h 22m 36s
build (oracle-plugin)	2h 7m 16s
build (cloudsql-mysql-plugin)	1h 22m 8s
build (cloudsql-postgresql-plugin)	11m 14s
	7h 3m 57s

Provide feedback