JS Client testsuite: server is not started because of missconfiguration

Since ER7 build, the ./run-domain.sh script is not able to start the servers for test execution because of configuration changes on the server side.

The following changes should be done:
the version of infinispan:server:core component should be changed from 8.3 to 8.4;
the version of infinispan:server:endpoint component should be changed from 8.0 to 8.1;
the server also doesn't recognize the "security-domain" and "auth-method" attributes on rest-connector elements.
I have made these changes to spec/config/domain.xml and ran the tests: they are passed.

The pull request with the changes will follow soon.