Merge pull request #74 from jeremyje/master

Update http header for retrieving instance metadata.
Merge pull request #75 from jeremyje/master

get_metadata_value now properly falls back to project level attributes.
Fix ssh keys files being emptied when disk is full.

Check that the disk has enough space (size of the ssh keys file + 1MB) before
attempting to move the temporary file to its final destination.
Merge pull request #76 from herbertd/master

Fix ssh keys files being emptied when disk is full.
- system parameter configuration file should not have executable bit
  set
  + this file is not executed, having the executable bit set generates
    a warning in OBS when packaging
Merge pull request #77 from rjschwei/noexecConf

Fix package creation warning