Fix some lint issues and test spec warnings

[cryptk]

EDIT: It's a slow day for me today... I went ahead and added documentation to the enterprise modules that were missing it. There should be no lint issues with this PR, squashed it down into the original commit.

Our automated test system was not happy about some of the lint issues (which were also detected by your lint tests as well) so I fixed those up.

While running the test suite I also noticed a couple of warnings about ensure being redefined in the sensu_client_spec.rb file so I cleaned that up as well.

For clarity, here are the lint issues that this fixes:

manifests/enterprise/dashboard/api.pp:1:documentation:WARNING:defined type not documented
manifests/enterprise/dashboard/api.pp:14:relative_classname_inclusion:WARNING:class included by relative name
manifests/enterprise/dashboard/config.pp:1:documentation:WARNING:class not documented
manifests/enterprise/service.pp:1:documentation:WARNING:class not documented
manifests/package.pp:165:variable_scope:WARNING:top-scope variable being used without an explicit namespace
manifests/package.pp:179:variable_scope:WARNING:top-scope variable being used without an explicit namespace
tests/sensu-server-cluster.pp:3:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:4:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:5:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:6:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:7:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:8:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:9:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:10:arrow_alignment:WARNING:indentation of => is not properly aligned
tests/sensu-server-cluster.pp:31:trailing_comma:WARNING:missing trailing comma after last element
tests/sensu-server-cluster.pp:30:trailing_comma:WARNING:missing trailing comma after last element

And here are the two test warnings:

/home/cryptk/Documents/sourcecode/sensu/spec/classes/sensu_client_spec.rb:13: warning: key :ensure is duplicated and overwritten on line 18
/home/cryptk/Documents/sourcecode/sensu/spec/classes/sensu_client_spec.rb:37: warning: key :ensure is duplicated and overwritten on line 43

[cwjohnston]

@cryptk thanks for the PR! this all looks reasonable to me.