Dns sync

Add cci dns sync (and other fixes)

CLI: adds 'sl cci dns sync'

usage: sl cci dns sync [-h] [--a] [--ptr] [--really] instance

Sync hostname to A and PTR records

positional arguments:
  instance      Instance ID

optional arguments:
  -h, --help    show this help message and exit
  --a, --A      Sync only the A record
  --ptr, --PTR  Sync only the PTR record
  --really, -y  Confirm all prompt actions