Removing snapshot for CDAP 6.11.1.1 release #1730

Job	Run time
build (cloudsql-postgresql-plugin)	6m 33s
build (mssql-plugin)	1h 13m 5s
build (postgresql-plugin)	33m 46s
build (cloudsql-mysql-plugin)	1h 4m 35s
build (oracle-plugin)	12m 55s
build (mysql-plugin)	1h 13m 13s
	4h 24m 7s

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