Additional repo and container cleanup
Additional repo and container cleanup

- Added support for adding custom repo (defaults to community)
- Added cleanup of the test container (--rm)
- Added --text to grep in apkv() to avoid "Binary file matches" output on Fedora

Signed-off-by: Cristiano Balducci <00d216b49bd05d481b403a30d677ec46dfa808b5@gmail.com>

aditirajagopal/docker,aditirajagopal/docker,aditirajagopal/docker