Fix ServerCommand UnitTests

[mdrillin]

Several of the server command tests (org.komodo.relational.commands.server) have been omitted from the tests (@ignore) - due to class cast exception in ServerShellCommand.getWorkspaceServer.
These are mock tests, and the issue only occurs when running the build from command line - they pass when run in eclipse.
There is some rework being considered which may resolve this - we need to revisit this issue and remove the ignores when possible.