Refactor CheckPath util function.

[vishal4071]

CheckPath function from utils/util.go gives a false sense of security, that the checked path exists, but this is susceptible to race conditions (where a path may already be gone as soon as this function returns). The functions using the CheckPath function after using it call things that may also return error, making the Check redundant.
Hence function, and the call is being removed.

Fixes: BUG1064014

[manith-arista]

Adding @mkisielewski-arista to this review.

My understanding of the requirement is that we intend to get rid of the file checks altogether, since:

1. A race condition might result in a false positive
2. Subsequent functions which use the file would anyway fail with an error if file was not present, hence making this check redundant.

If that is the case, we don't want to replace util.CheckPath() with os.Stat() checks, instead we want to remove util.CheckPath() altogether, and ensure that the code is able to exit gracefully even without this check.

[manith-arista]

Code changes look good.
Few things to keep in mind regarding future reviews:

1. Make the commit message descriptive, it makes it easy to understand the context later.
2. Follow branch naming convention name.feature or name-feature for future
3. Add FIXES: BUGxxx in the commit description to update Bugsby, not PR description

[vishal4071]

Done,Thanks! Manith, I will take care from now onwards as per your suggestion.