Adding plugin handler test makefile target

[prietyc123]

What type of PR is this?

/kind feature

What does does this PR do / why we need it:

$SUBJECT It was missed in the make target. To run the individual target we need it.

Which issue(s) this PR fixes:

Fixes NA

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

make test-plugin-handler as well as make test-integration should run

[amitkrout]

/lgtm

[prietyc123]

/retest

[girishramnani]

Is it present in .travis.yaml?

[prietyc123]

Is it present in .travis.yaml?

No, I didn't find any. Let me add it to travis as well 👍

[girishramnani]

Cool

[amitkrout]

Add the test target in travis CI

[amitkrout]

/lgtm

[girishramnani]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: girishramnani

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Needs approval from an approver in each of these files:

• OWNERS [girishramnani]

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[codecov]

Codecov Report

Merging #3787 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3787      +/-   ##
==========================================
+ Coverage   44.15%   44.19%   +0.04%     
==========================================
  Files         139      139              
  Lines       13345    13388      +43     
==========================================
+ Hits         5892     5917      +25     
- Misses       6874     6888      +14     
- Partials      579      583       +4     

Impacted Files	Coverage Δ
pkg/devfile/parser/parse.go	53.84% <0.00%> (-2.09%)	⬇️
pkg/testingutil/devfile.go	0.00% <0.00%> (ø)
pkg/devfile/parser/types.go	70.21% <0.00%> (+1.38%)	⬆️
pkg/devfile/parser/data/2.0.0/components.go	39.03% <0.00%> (+2.19%)	⬆️

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