Description of problem:
/distribution/pkginstall can't included in job xml when submit workflow-kernel with --install option by command line.

Version-Release number of selected component (if applicable):
$ rpm -qa|grep beaker
beaker-redhat-0.1.42-1.el6eso.noarch
beakerlib-1.3-7.el6.noarch
beakerlib-redhat-1-5.el6.noarch
beaker-client-0.7.3-4.el6eso.noarch
beaker-redhat-repo-0.2-6.el6eso.noarch
beaker-0.7.3-4.el6eso.noarch

How reproducible:
always

Steps to Reproduce:
$ bkr workflow-kernel --arch=x86_64 --distro=RHEL6-6.1 --variant=server  --install=nfs-utils-lib --repo=http://lacrosse.corp.redhat.com/~yanwang/nfs-utils/ --task=/kernel/filesystems/nfs/ltp-nfstests  --prettyxml --debug --dryrun --lite

Actual results:
<job retention_tag="Scratch">
	<whiteboard>
		None None
	</whiteboard>
	<recipeSet>
		<recipe ks_meta="method=nfs" whiteboard="">
			<distroRequires>
				<and>
					<distro_name op="=" value="RHEL6-6.1"/>
					<distro_variant op="=" value="server"/>
					<distro_method op="=" value="nfs"/>
					<distro_arch op="=" value="x86_64"/>
				</and>
			</distroRequires>
			<hostRequires>
				<and>
					<key_value key="CPUVENDOR" op="=" value="GenuineIntel"/>
					<arch op="=" value="x86_64"/>
					<cpu_count op="&gt;" value="1"/>
					<hypervisor op="=" value=""/>
				</and>
			</hostRequires>
			<repos>
				<repo name="myrepo_0" url="http://lacrosse.corp.redhat.com/~yanwang/nfs-utils/"/>
			</repos>
			<partitions/>
			<task name="/distribution/install" role="STANDALONE">
				<params/>
			</task>
			<autopick random="true"/>
			<task name="/kernel/filesystems/nfs/ltp-nfstests" role="STANDALONE">
				<params/>
			</task>
		</recipe>
	</recipeSet>


Expected results:
/distribution/pkginstall task should be included in xml.

Additional info: