Since abuild v2.22.0, these are removed automatically unless 'libtool'
option has been specified.

upstream report:
https://github.com/FreeRADIUS/freeradius-server/issues/1222

nodejs-4.0.0 incorporates changes from the iojs fork since the projects
have merged.

Also add install_if on existing bash-completion subpackage

fixes #4613

Also install go and gofmt binary to /usr/lib/go/bin and symlink it to
/usr/bin. Also fix removal of tests.