Change PASSWORD field in master_password file to avoid confusion. fixes #12
Cosmetic changes, fixes #13
Fix ipmitool calls, fixes #14, fixes #20

- connect should use run
- args should be in an array and not use strings with spaces
- some commands need to be run using os.system to be able to
  show host's name and the output of ipmitool on the same line.
Delete useles option (now in separate plugin) fixes #17
Verify we have only one host when using clara nodes connect. Fixes #16
Add test for comptability with systemd. fixes #19
Supress output from "service conman status". Fixes #18
Change behavior when a value is not in the config file. Fixes #10
Indentantion and format fixes. Release.