Test: use trial license for full cluster restart tests
Test: use trial license for full cluster restart tests

This updates the full cluster restart tests to use a trial license so
that security and watcher functionality can be tested. This is needed
as a result of changing the default license type to basic.

Relates elastic/x-pack-elasticsearch#3878
relates elastic/x-pack-elasticsearch#3975

Original commit: elastic/x-pack-elasticsearch@9a1c920bc2784292aa9e2b32412f7beba257631a

strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra