[SGW] TLS required by default from Sync Gateway 3.0

Sync-Gateway test case(s) affected: TestSyncGatewayCreateRemote

Refer: https://docs.couchbase.com/sync-gateway/current/secure-sgw-access.html#overview

TLS not used in test case mentioned above: https://github.com/couchbase/couchbase-operator/blob/master/test/e2e/sync_gateway_test.go#L83

Error: 

2022-02-28T10:58:21.455Z [ERR] Couldn't start Sync Gateway: 1 errors:

Must use secure scheme in Couchbase Server URL, or opt out by setting bootstrap.use_tls_server to false. Current URL: couchbase://test-couchbase-2shsz-srv.test-hqbzd?network=default -- rest.ServerMain() at main.go:26 

Resolution: Skip TestSyncGatewayCreateRemote against Sync Gateway Images >= 3.0.0

as we will be already testing the required scenario in TestSyncGatewayCreateRemoteTLS.  (https://github.com/couchbase/couchbase-operator/blob/master/test/e2e/sync_gateway_test.go#L87 )

If this is not acceptable, we would need to set the bootstrap.use_tls_server to false in sync_gateway.json (https://github.com/couchbase/couchbase-operator/blob/515dfb9b8b2575d2f46715a33473380e1e06de21/test/e2e/e2eutil/sync-gateway.go#L113 ) according to different SGW image versions.

Skipping makes more sense without cluttering the codebase, but I would leave it to you for the final decision.

CC: Simon Murray