OCM-6858 | Add validator for node drain grace period in interactive mode

[philipwu08]

Add validator to check the value of the node drain grace period in interactive mode.

[codecov]

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 21.33%. Comparing base (709d754) to head (76e5f4a).
Report is 4 commits behind head on master.

Files	Patch %	Lines
cmd/create/machinepool/nodepool.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1866      +/-   ##
==========================================
+ Coverage   21.11%   21.33%   +0.22%     
==========================================
  Files         104      113       +9     
  Lines       17693    19041    +1348     
==========================================
+ Hits         3736     4063     +327     
- Misses      13679    14666     +987     
- Partials      278      312      +34     

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[philipwu08]

Thanks @robpblake for the review. Updated MR based on comments. Thanks.

[robpblake]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: philipwu08, robpblake

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[openshift-ci]

@philipwu08: all tests passed!

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