xci: Drop OPNFV_RELENG_DEV_PATH variable
The OPNFV_RELENG_DEV_PATH variable was used to point to a releng-xci
development repository. However, people normally set the current
directory as the development one and they almost always want to
test the current code in XCI. Using an secondary releng-xci tree
as development repo is a very obscure case and it normally complicates
things. As such, let drop this option and always use the current
repository for development purposes.
Change-Id: If111bf29a32a5f6ea28694f191645af0c6a87abc
Signed-off-by: Markos Chandras <mchandras@suse.de>