createrepo: add wrapper script to fix paths

createrepo: add wrapper script to fix paths

Fixes sstate relocation due to the path to /etc/rpm being baked into the
libraries - this manifested in the form of the following assertion at
runtime:

python: dbconfig.c:493: db3New: Assertion `dbOpts != ((void *)0) && *dbOpts != '\0'' failed.

Fixes [YOCTO #2753].

(From OE-Core rev: b5028cc84ad7c40c51cadbdf7fdc892cde4462cb)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>