Another fix for the plugins example

[mbarto]

Description

Included standard epics

Issues

• Fix plugins example not including standard epics

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
plugins example not including standard epics

What is the new behavior?
plugins example including standard epics

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[offtherailz]

please fix lint before merge

[coveralls]

Coverage increased (+0.006%) to 80.699% when pulling 58f5da6 on mbarto:plugins_example_fixes into 6416f23 on geosolutions-it:master.