ipam pool leak fix

[aegal]

Reason for Change:
This is to address the potential for IPAM to leak IP's and have the pool be stuck in a 'in use ' state.

Issue Fixed:
#633

This also reintroduces some tests that were last in previous commits.

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests

Notes:

[codecov]

Codecov Report

Merging #640 into master will increase coverage by 0.08%.
The diff coverage is 84.37%.

@@            Coverage Diff             @@
##           master     #640      +/-   ##
==========================================
+ Coverage   42.00%   42.09%   +0.08%     
==========================================
  Files          71       72       +1     
  Lines       10229    10362     +133     
==========================================
+ Hits         4297     4362      +65     
- Misses       5459     5531      +72     
+ Partials      473      469       -4     

[tamilmani1989]

I didnt see in releaseaddress id is reset to empty? how is it handled?

[aegal]

I didnt see in releaseaddress id is reset to empty? how is it handled?

Discussed offline, it is already handled in the releaseaddress

[tamilmani1989]

lgtm

Dismissing this since you are on vacation, discussed offline, addressed all comments

[EdmondAndy]

Hi,

see the change for "ipam pool leak fix" has been merged for CNI issues.
Can you please confirm which aks version will include this fix? thanks

Ed