Trim spaces in annotation list

[juliabiro]

Our users often provide their annotation list about secrets to watch in a comma AND space separated list, like this:
"secret1, secret2, secret3". This causes Reloader to pick up on only the first secret, and ignoring changes on the rest. Since this is a very natural expression of lists and aligns with the format used in other annotation lists, I would like to accommodate this.

I bumped into some problems in our systems because of the extra spaces, this is why I am posting this PR. I am happy to answer any questions.

[stakater-user]

@juliabiro Image is available for testing. docker pull stakater/reloader:SNAPSHOT-PR-165-1

[stakater-user]

@juliabiro Image is available for testing. docker pull stakater/reloader:SNAPSHOT-PR-165-2

[blackjid]

This is very helpful because you can use the Replace newlines with spaces (folded) from yaml so you can list each secret on it's own line https://yaml-multiline.info/

secret.reloader.stakater.com/reload: >-
  first-secret,
  second-secret,