DNS fixups, CLI Fixups

CLI: Fixed 'sl dns edit'
CLI: CLIAbort now accepts a message as the first argument
CLI: If SystemExit.message exists, print to stderr
CLI: CCI details now returns known PTR records too
CCI: details now return hostname and domain as well
Add cci dns sync

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
Fixed up CLIAbort tests
Merge pull request #40 from CrackerJackMack/dns_sync

DNS Sync