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

Refactor volume migration.

Split the volume migration into 2 separate steps:
- `step1`: create snapshot of source volume
- `step2`: clone snapshot + flatten clone + copy clone to destination
  volume

Introduce a parameter which configures, whether `step2` is done while
the VM is off.

Original (non-default) flow:
1. shutoff source VM
2. perform `step1` + `step2` (originally not split)
3. start source VM
4. ...

New default flow:
1. shutoff source VM
2. perform `step1`
3. start source VM
4. perform `step2`
5. ...

Rationale: There is no reason to keep the source VM off once the
snapshot is created. The VM is started after the migration anyway, so
the source and destination volumes will diverge eventually. The new
default approach aims to reduce the time the VM is off.

Fix flavor mapping

See merge request !30

Feature mapping csirtmu.* flavors to g2.*

See merge request !29

Fix value None in key_name

See merge request !28