Vagrant: Add default host fwd port

[elfadel]

This PR should fix #324

[elfadel]

@nam-jaehyun should I open an issue first?
If not, please review.

[nam-jaehyun]

DLV_RPORT is defined in the Makefile, and we're using "make vagrant-{up|ssh|destory}".

[nam-jaehyun]

you can raise an issue and finalize this PR.

[codecov-commenter]

Codecov Report

Merging #323 (fad2eab) into master (efe9b2f) will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   37.79%   37.43%   -0.36%     
==========================================
  Files          21       21              
  Lines        8943     8943              
==========================================
- Hits         3380     3348      -32     
- Misses       5216     5248      +32     
  Partials      347      347              

Impacted Files	Coverage Δ
KubeArmor/core/dockerHandler.go	52.14% <0.00%> (-12.46%)	⬇️
KubeArmor/monitor/systemMonitor.go	32.50% <0.00%> (-0.39%)	⬇️
KubeArmor/core/kubeUpdate.go	49.72% <0.00%> (-0.19%)	⬇️
KubeArmor/feeder/policyMatcher.go	36.50% <0.00%> (+0.52%)	⬆️

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