fix: specify project domain in pipeline, block source VM start before ehpemeral disk is migrated

See merge request !42

Prevent the ceph-volume migration function to start the VM if there are
ehpemeral disks as well.

The domain is used to pick appropriate SRC and DST RC_FILE.
RC_FILEs are defined in repo variables for each domain-specific migrator
user.

Fix source subnet empty name bug

See merge request !41

fix: flavor mapping for hpc.xlarge* and elixir.24core-256ram

See merge request !40

ssh configuration and code update, to use actuall config

See merge request !38

ssh configuration and private key fix

See merge request !37

extend generation of data for communication by adding perun group link

See merge request !36

add possibility to migrate VM with ephem disk

See merge request !35

feat: speed-up volume migration procedure

See merge request !34

Modified the volume migration procedure - add option to skip the
deep-copy step, in order to speed up the procedure:
  - old steps:
    - create src snapshot
    - delete dst volume
    - clone snapshot
    - flatten clone
    - deep-copy clone to dst volume
    - delete clone
    - delete snapshot
  - new steps:
    - create src snapshot
    - delete dst volume
    - clone snapshot to dst volume
    - flatten clone
    - delete snapshot

fix: hpc.16core-* -> c3.16core-* flavors mapping

See merge request !33

Map G1 hpc flavors to already present G2 c3 flavors with slightly less
RAM.

fix: disable less usefull pylint errors on specific lines

See merge request !32

feat: change volume migration procedure

See merge request !31