Remove remote before adding.
Remove remote before adding.

When the flynn server is replaced git remote add was failing silently when creating the app with the new server. It should either remove the previous server or issue a warning.

Signed-off-by: João Mares <c7b03b8437613ec3fb59ca22678ff1b32658a5dd@gmail.com>

flynn-archive/flynn-cli,flynn-archive/flynn-cli