Add chmod and chown on files created in script sshkeys

 - modify slave script sshkeys: if .ssh directory or .ssh/authorized_keys
  file is created by this script, change ownership on this file and
  directory to USER (to who belongs to). Also change permissions on file
  to 644 and directory to 755 if they are newly created there.
 - add this change to debian changelog
Merge pull request #488 from stavamichal/fixInSshKeySlaveScript

Add chmod and chown on files created in script sshkeys