Change the plugin now to query to the dockerd unix domain socket

[subzero79]

Other changes:

• Remove the api port field (existing users that query this port using other apps will need to reconfigure /etc/default/docker manually)
• Remove the copy source-destination for storage driver path (existing users will need to clear cache) to remove these visual elements.
• Add docker info to the settings.
• The plugin now configures dockerd with the -g parameter. No more mount bind in fstab. This should fix the problem when using a shared folder from a zfs volume.
• Added a mkconf script to recreate /etc/default/docker when required. This existed before in php backend.

Please test

[ryecoaaron]

Looks good to me. Why did you leave the " . " when setting $url though?

[subzero79]

I corrected the api url. Also there was an error in a variable in mkconf

[subzero79]

I think i need to fix the logic in postint. Everything from line 33 to line 59 should be moved to confdbadm migrate. I am not sure if the migrate facility is for that.