_GetParents does not account for comments

[GoodEveningMiss]

https://github.com/google/capirca/blob/master/lib/naming.py#L213

All the other methods to retrieve or search for tokens strip off any potential comments and whitespace before making any comparison. _GetParents does not. Library could be improved in general by stripping off comments when parsing and saving it as its own attribute.

[GoodEveningMiss]

Also in GetIpParents:
https://github.com/google/capirca/blob/master/lib/naming.py#L173

[ankenyr]

This was in the last push d10959d