Description of problem:

A Job with a device specification such as:

<device op="!=" driver="some-driver"/>

fails with:

Failed to import job because of: "Error in hostRequires: Neither 'InstrumentedAttribute' object nor 'Comparator' object has an attribute '__equal__'"


Sample job:

<job retention_tag="120days">
	<whiteboard>
		Testing Device specification
	</whiteboard>
	<recipeSet priority="High">
		<recipe kernel_options="" kernel_options_post="" ks_meta="" role="None" whiteboard="">
			<autopick random="false"/>
			<watchdog panic="ignore"/>
			<packages/>
			<ks_appends/>
			<repos/>
			<distroRequires>
				<and>
					<distro_family op="=" value="RedHatEnterpriseLinux6"/>
					<distro_variant op="=" value="Workstation"/>
					<distro_name op="=" value="RHEL6.4-20130130.0"/>
					<distro_arch op="=" value="x86_64"/>
				</and>
			</distroRequires>
			<hostRequires>
				<and>
	                                <system_type op="=" value="Machine"/>
                                        <device op="!=" driver="pcieport-driver"/> 
				</and>
			</hostRequires>
			<partitions/>
			<task name="/distribution/install" role="STANDALONE">
				<params/>
			</task>
			<task name="/distribution/reservesys" role="STANDALONE">
				<params>
					<param name="RESERVETIME" value="86400"/>
				</params>
			</task>
		</recipe>
	</recipeSet>
</job>


In my preliminary tests, it seems to be only "driver" attribute that demonstrates this bug. Something like this succeeds:

<device op="!=" type="USB" />


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Submit sample job
2. 
3.
  
Actual results:


Expected results:


Additional info: