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 #89 from bkutil/add_applied_attribute

Add optional crowbar-applied boolean attribute to schema
Fix the syslog service name for SLE12
Merge pull request #91 from rhafer/sle12

Fix the syslog service name for SLE12
fix indentation: two spaces
no need to edit the syslog config on SLE12

SLE12 already comes with rsyslog preinstalled and teh SYSLOG_DAEMON is
not present in the default config.
Merge pull request #92 from mapleoin/sle12-rsyslog

no need to edit the syslog config on SLE12
use a guard instead of an if block for chef style
Merge pull request #93 from mapleoin/sle12-rsyslog

use a guard instead of an if block for chef style