Support using both remote repos and a persistent clone

[bpineau]

Should close #86 (thanks @tchellomello)

[coveralls]

Coverage decreased (-0.6%) to 85.594% when pulling 5596a90 on start-with-existing-repos into 929386f on master.

[tchellomello]

@bpineau
I've updated my deployment with the new image as below:

kubectl set image deploy/katafygio-git katafygio=bpineau/katafygio:v0.8.0-remoteandlocalpersist --record
deployment.extensions/katafygio-git image updated

The new pod loaded as expected:

Containers:
  katafygio:
    Container ID:  containerd://790e6da81087fa9c81ca9bde79b100a7602b18a9ca1e9bb0e23ea4e8c3c927d9
    Image:         bpineau/katafygio:v0.8.0-remoteandlocalpersist
    Image ID:      docker.io/bpineau/katafygio@sha256:8c406df8089c5b078b9b19f121ae603eb2cd2a5ba6618eea7a7ca51af8bcb2d6
    Port:          8080/TCP
    Host Port:     0/TCP
    Command:
      /usr/bin/katafygio
      --local-dir=/var/lib/katafygio/data
      --healthcheck-port=8080
      --git-url=http://katafygio:<REDACTED>@gitea-http-service.default.svc.cluster.local/mmello/katafygio-backups.git
      --log-level=info
      --log-output=stdout
      --resync-interval=300
      --exclude-kind=replicaset
      --exclude-kind=endpoints
      --exclude-kind=event
    State:          Running
      Started:      Sun, 21 Jul 2019 22:12:03 -0400
    Ready:          True
    Restart Count:  0

To re-test t, I've forced a kill and started it again

kubectl delete pod katafygio-git-bdcfbb7f-wjstf
pod "katafygio-git-bdcfbb7f-wjstf" deleted

And voilla!! It worked like a charm!!! 👍

kubectl logs katafygio-git-bdcfbb7f-jqfh6
time="2019-07-22 02:16:25" level=info msg="katafygio starting"
time="2019-07-22 02:16:25" level=info msg="Starting http healtcheck handler"
time="2019-07-22 02:16:25" level=info msg="Starting git repository synchronizer"
time="2019-07-22 02:16:25" level=info msg="Starting event recorder"
time="2019-07-22 02:16:25" level=info msg="Starting all kubernetes controllers"

Local and remote git updated as expected. All working as expected!! Good job @bpineau !!!! Thanks for the quick fix!! 🥇