Added new exceptions to be used with Git Automate

This work is related to the GIT Issue.
https://github.com/ManageIQ/manageiq/issues/1199

Issue #1199
Use Domain instead of Namespace in specs

Issue #1199

When we move to GIT a domain woud be a separate repository and will
be distinct from Namespaces. In the Postgres the Domain and Namespace
are stored in the same table.
The specs were changed to count namespaces separately from domains.
Merge pull request #1216 from mkanoor/namespace_to_domain

Use Domain instead of Namespace in specs
Merge pull request #1204 from mkanoor/git_exceptions

Added new exceptions to be used with Git Automate
Move variable initialization for clarity.
Merge pull request #1217 from martinpovolny/workers_tab_followup

Move variable initialization for clarity.
Rename method .validate to .validate_settings for FileDepotSmb and FileDepotFtp.

To avoid overriding rails .validate method.
https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Delete FileDepot.verify_depot_hash and FileDepot#verify_credentials.

Instead of calling FileDepot.verify_depot_hash, the caller should call .validate_settings based on the depot's class.
Instead of calling FileDepot#verify_credentials, the caller should call . verify_credentials based on the depot's class.
https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Fix the log message about depot settings.

Which is used by both log depot and DB backup.
https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Fix MiqSchedule.verify_depot_hash to call FileDepot's subclass method directly

to validate the depot settings based on the depot's type.
https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Add a flash message when MiqSchedule.verify_depot_hash fails.

https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Fix the spec for MiqSchedule.verify_depot_hash.

https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Add FileDepot.supported_protocols

https://bugzilla.redhat.com/show_bug.cgi?id=1173213
Merge pull request #1 from brandondunne/add_FileDepot_supported_protocols

Add FileDepot.supported_protocols
Update to latest Fog

Includes changes to allow passing "block_device_mapping_v2" in the clone options
https://bugzilla.redhat.com/show_bug.cgi?id=1160342
Merge pull request #1222 from lfu/backup_vmdb_1172491

Fix the issue with schedule backup of internal DB
Merge pull request #1223 from brandondunne/openstack_boot_from_volume

Update to latest Fog (1.26.0)
Replaced ajax calls from prototype to jquery.

- Replaced occurrences of Ajax.Request to $j.ajax
- Changed default type for ajax calls to be "POST", this was "GET" by default.
- Changed occurrences or "Parameters" on ajax calls to "data", jquery expects "data" to be present that it uses to convert to a querystring and send it upto the server.
- Changed miq_dhtmlxtoolbar.js to strip out "?" from the params that is the first character in the button.url_parms string, jquery expects data to be a key/value pair.

Issue #1150