systemtap: add python and bash dependencies

systemtap: add python and bash dependencies

There are a number of scripts in the systemtap installation that use
python and bash, so we need to add run-time dependencies for them.  If
not, we can generate build errors like "no package provides
/usr/bin/python".

Fixes [YOCTO #3951].

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>