AI-5699 - Drop unused gem groups

Previously we had three gem groups in the Gemfile.

• test - one one we use
• development - travis gems which we never use.
• system_tests - beaker which we unfortuantly do not use.

The other groups were blindly copied from voxpup universe.

The advantage of this is that we remove some unescessary options from the CLI process making things simpler.

Also image should be marginally smaller.

Fixes: AI-5699