Add new linter rule: Compare pointer to value

[nunnatsa]

Description

The linter warns when comparing a pointer with a value. These comparisons are always wrong and will always fail.

For example:

num := 5
...
pNum := &num
...
Expect(pNum).ShouldNot(Equal(6))

The linter will suggest to use this instead:

Expect(pNum).ShouldNot(HaveValue(Equal(6)))

Fixes #76

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

• [x] Added test case and related test data
• [x] Update the functional test

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] I ran golangci-lint

@BorzdeG

[coveralls]

Pull Request Test Coverage Report for Build 4587736517

• 80 of 90 (88.89%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 84.161%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
ginkgo_linter.go	80	90	88.89%
<!--	Total:	80	90	88.89%	-->

Totals
Change from base Build 4525032112:	0.2%
Covered Lines:	797
Relevant Lines:	947

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💛 - Coveralls