release_tool: Add interactive menu item for Git repo refresh.
release_tool: Add interactive menu item for Git repo refresh.

Changelog: None
Signed-off-by: Kristian Amlie <505e66ae45028a0596c853559221f0b72c1cee21@mender.io>

pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration