fixed RPM bash completion for dcache

The bash completion file for the RPM was broken, even if it was not using the
old /opt layout.

* Removed the path to the binary to be completed.

Require-notes: no
Require-book: no

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Merge pull request #164 from kofemann/fix-2-2

push existing fix into 2.2 branch