build-pkgs --clean returns error due to invalid or undefined path

[Erich Cordoba]

Steps to reproduce
------------------

Running the following command:

build-pkgs --clean sysinv

Expected behavior
-----------------

The command should clean the sysinv package

Actual behavior
---------------

The command returns the following error:

CLEAN_FLAG=1
EDIT_FLAG=0
TARGETS_STD= sysinv
TARGETS_RT=
TARGETS_INSTALLER=
EXTRA_ARGS_COMMON=''
EXTRA_ARGS_SRPM=''
EXTRA_ARGS_RPM=''
TARGETS=' sysinv '
TARGETS_STD=' sysinv '
TARGETS_RT=' '
TARGETS_MISC=' '
/build-rpms-parallel --std --clean sysinv
/localdisk/designer/jenkins-slave/starlingx/cgcs-root/build-tools/build-pkgs-parallel: line 257: /build-rpms-parallel: No such file or directory

Looking into the code this line is executed:

$DIR/build-rpms-parallel --std --clean $EXTRA_ARGS_COMMON $EXTRA_ARGS_RPM $TARGETS_STD $TARGETS_MISC || exit 1

It seems that $DIR doesn't get a proper value.

Reproducibility
---------------
100% of the times

Branch
------
master on commit b913f3ec3

[Lin Shuicheng (shuicheng)]

I just noticed this issue. It is fixed with below patch which is already merged:
https://review.openstack.org/#/c/600363/