[159] Improve apply arguments parsing logic

[borland667]

What?

• Current logic for parsing arguments after apply does not work as expected.
• leverage tf apply -target kubernetes_manifest.irfq -> fails
• leverage tf apply -target kubernetes_manifest.irfq -> works

Why?

• both options for specifying parameters with space or equal should work.

References

• https://github.com/binbashar/leverage/issues/159
• closes #159

Before release

Review the checklist here

[coveralls]

Pull Request Test Coverage Report for Build 8739936615

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 55 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 59.148%

---

Files with Coverage Reduction	New Missed Lines	%
modules/terraform.py	55	38.28%
<!--	Total:	55		-->

Totals
Change from base Build 8739620586:	0.3%
Covered Lines:	1261
Relevant Lines:	2041

---

💛 - Coveralls