Add Support for Syncing Remote Updates to Local

[sostheim]

Need to have the ability to have the repo under archivist watch sync:

• pull: updates made to remote origin master -> local origin master
• push: updates made to local origin master -> remote origin master
• both: pull & push updates

Currently can only support push, need to add pull / both.

[sostheim]

Added in commit: https://github.com/samsung-cnct/git-archivist/commit/f4f5e63385bd4d8cced7f03894b02222967cdd17

[sostheim]

container image is: rc (https://quay.io/repository/samsung_cnct/git-archivist?tab=tags)
review in craic cluster test before cutting beta:0.2.1