iec: aarch64 baremetal POD: map name, cron trigger

iec: aarch64 baremetal POD: map name, cron trigger

IEC Fuel deploy scripts need a mapping between the Jenkins node (slave)
name and its lab/pod naming scheme, i.e. for the new baremetal POD
`ubuntu1804-dev-96c-256g-1` we will use `arm-baremetal1` for PDF/IDF
filenames.

While at it, update related jobs:
- extend ci-management static slave init jobs to also generate jobs
  for the new AArch64 baremetal POD label (aarch64_baremetal_dev).
- exclude Ubuntu 16.04 / CentOS from Fuel baremetal job matrix since
  baremetal provisioning in Fuel only supports Ubuntu 18.04 currently;
- schedule IEC Type 2 Fuel baremetal deployment every day @ 01:00;
- fix GERRIT_REFSPEC job paramater being ignored for IEC jobs;

JIRA: IT-19425
JIRA: IT-19445

Change-Id: I1e1debb7ad61e6aac7a6304ecc2bd5fd6e9fe3ce
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>