make sure plugins installed before service is started

[shamil]

Pull request acceptance prerequisites:

• Signed the CLA (if not already signed)
• Rebased/up-to-date with base branch
• Tests pass
• Updated CHANGELOG.md with patch notes (if necessary)
• Updated CONTRIBUTORS (if attribution is requested)

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[shamil]

@fatmcgav can you please take a look at this change. Currently this blocking from us to upgrade the module, since we install some plugins.

[fatmcgav]

@shamil thanks for putting in a fix.
I'm currently on vacation, back on the 4th, so can look at doing a formal review and merge then...

The changes all look sane though.
One minor one - would you be able to add some tests that verify this behaviour?

Thanks

[shamil]

@fatmcgav added test

[fatmcgav]

One tweak to the test, but otherwise this LGTM :)

[fatmcgav]

LGTM

[shamil]

Thanks for approval @fatmcgav
Do I need to do anything else to get this PR merged and get bug-fix release ;) ?

[fatmcgav]

@shamil I've just merged this PR. Thanks again for the contribution.

WRT a bug-fix release, I'll look to get that done this week, as there's a couple of other PR's I want to follow up on aswell :)