Change variable name from IP6tables back to Ip6tables.

[csfmomo]

fix: variable name

NMAgent is using npm package. A change in NPM package const variable blocked build. Change variable name back to unblock build.

Reason for Change:
NMAgent is using npm package. A change in NPM package const variable blocked build. Change variable name back to unblock build.

Issue Fixed:
Build blocking.

build: Build 🏭

[codecov]

Codecov Report

Merging #669 into master will decrease coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
- Coverage   42.05%   41.72%   -0.34%     
==========================================
  Files          72       71       -1     
  Lines       10350    10200     -150     
==========================================
- Hits         4353     4256      -97     
+ Misses       5524     5490      -34     
+ Partials      473      454      -19