Add optional crowbar-applied boolean attribute to schema

We add a crowbar applied attribute to mark the proposal as applied after
the chef run. This allows the UI to show that the current form of the
proposal has been 'applied' successfully (i.e. chef-client completed the
run w/ success) and that the proposal was not modified after that.

Update the proposal_schema_revision, so we can add the attribute to
schema for ('3rd party') barclamps that currently do not have it.

Refs: crowbar/crowbar#2044 (which adds this attribute to barclamps which
lack it), crowbar/barclamp-crowbar#1068 (which marks the proposals as
applied) and https://bugzilla.novell.com/show_bug.cgi?id=877486
Merge pull request #371 from bkutil/add_applied_attribute

Add optional crowbar-applied boolean attribute to schema
Merge pull request #370 from dirkmueller/master

add travis testing support
Use secure password

We really want to protect this from accidental
guessing.
Merge pull request #372 from dirkmueller/security

Use secure password
fix nova.conf permissions

file should be readable by nova, but only modifiable by root
Merge pull request #373 from mapleoin/user-group

fix nova.conf permissions
Merge pull request #374 from dirkmueller/master

Ignore return value of open-iscsi start
Make Nova V3 API optional and disabled by default

It seems upstream decided to put v3 off by default for
icehouse. So adjust our cookbook accordingly.