build-auto: fix builder selection based on hostname

the '.. | read ' spanws a subshell, which means we always hit the exit 1
at the bottom.  Avoid using a pipe with read to avoid this.

Signed-off-by: Sage Weil <sage@inktank.com>
kenrel-config: rename basic->debug, add basic from vanilla ubuntu

This is from ubuntu upstream 3.8 kernel package.

Signed-off-by: Sage Weil <sage@inktank.com>
fabfile: update kenrel gitbuilder hostnames

Signed-off-by: Sage Weil <sage@inktank.com>