Corrected misspellings for form button definitions

Corrections made to to spell "editing" in both the form and spec code
Merge pull request #909 from GregP/misspelled_editing_message

Corrected misspellings for form button definitions
Add :save option to FileDepot.depot_hash=.

So that a file depot can be validated without saving the record into DB.

https://bugzilla.redhat.com/show_bug.cgi?id=1151173
Add FileDepotFtp.verify_depot_hash

to validate the ftp credentials.

https://bugzilla.redhat.com/show_bug.cgi?id=1151173
Let LogFile.verify_log_depot_settings support ftp validation as well.
It currently supports NFS and Samba validation.

https://bugzilla.redhat.com/show_bug.cgi?id=1151173
Add test cases.
https://bugzilla.redhat.com/show_bug.cgi?id=1151173
Fix spec for MiqSchedule where FileDepot's uri is set to nil.

https://bugzilla.redhat.com/show_bug.cgi?id=1151173