[YUNIKORN-2694] Improve placement rule funtion's test coverage

[SP12893678]

What is this PR for?

Improve placement rule funtion's test coverage
The placement code will now have full coverage.

• placement_test.go
• provided_rule_test.go
• rule_test.go

What type of PR is it?

• - Test

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2694

[wilfred-s]

Please check the changes in PR #891 as things might clash with this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.48%. Comparing base (67a7167) to head (2684584).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #899      +/-   ##
==========================================
+ Coverage   78.24%   78.48%   +0.23%     
==========================================
  Files          97       97              
  Lines       12210    12210              
==========================================
+ Hits         9554     9583      +29     
+ Misses       2350     2329      -21     
+ Partials      306      298       -8     

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[SP12893678]

Please check the changes in PR #891 as things might clash with this PR.

Oh, it might happen.
I will rebase the latest commit and retest it after PR #891 is merged.

[pbacsko]

Found some minor things

[manirajv06]

#891 has gone in. Can you rebase and resolve conflicts?

[SP12893678]

#891 has gone in. Can you rebase and resolve conflicts?

Sure! Please take a look.
I also append new test case for new code from testrule.go

[pbacsko]

+1