remote-helpers: update version test scrtip

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
remote-helpers: remove version test script

Testing mostly done by Travis CI.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
remote-bzr: add support for older versions

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>