Jenkinsfile: Echo the branch you are building

Signed-off-by: Fisnik Hajredini <fhajredini@luxoft.com>
(cherry picked from commit f28fc5c)

Jenkinsfile: parameterize variants & images to be built

The variants and images to be built were hardcoded in
JenkinsFile. So if there was a need to add or remove
variants and images, the code needs to be changed. With
this change, a list of variant and images are defined
in Jenkins Environment, which are read dynamically in
JenkinsFile. So adding/removing variants and images do
not require code change.

Signed-off-by: Tariq Ansari <tansari@luxoft.com>
(cherry picked from commit a0d6cdf)

Add CI job for arp target

Code change is meant for building arp target as well for any change in meta-bistro.

Signed-off-by: Sapan Das <SKumarDas@luxoft.com>

PELUX 1.0

PELUX 1.0