[HotFix] Port Creation Fix in DPM v2.0

[chenpiaoping]

Fix the port creation failure in DPM v2.0.

[codecov-io]

Codecov Report

Merging #530 (21f0a78) into master (9008390) will increase coverage by 0.07%.
The diff coverage is 76.19%.

@@             Coverage Diff              @@
##             master     #530      +/-   ##
============================================
+ Coverage     32.74%   32.82%   +0.07%     
- Complexity     1108     1115       +7     
============================================
  Files           473      473              
  Lines         11751    11772      +21     
  Branches       1514     1521       +7     
============================================
+ Hits           3848     3864      +16     
- Misses         7368     7370       +2     
- Partials        535      538       +3     

Impacted Files	Coverage Δ	Complexity Δ
.../portmanager/processor/SecurityGroupProcessor.java	54.65% <68.75%> (+3.22%)	17.00 <0.00> (+4.00)
...lcor/portmanager/processor/DataPlaneProcessor.java	63.12% <100.00%> (+0.46%)	30.00 <0.00> (+1.00)
...rewei/alcor/portmanager/processor/PortContext.java	48.64% <100.00%> (+2.16%)	21.00 <2.00> (+2.00)

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[chenpiaoping]

@xieus @kevin-zhonghao Please review this PR when you have time.

[xieus]

LGTM.