fix system parameters for bosh agent

For bosh agent, we should always use vsphere as infrastructure when building
for vcloud.

Change-Id: If69b2ef4462a6b852226711047fd175df75090f7
fix micro bosh release manifest

Change-Id: I5d2361e13c68083008a3d7b435d583dc7a62985c
add bat template for vcloud

Change-Id: Ia19d529e233cbea3b6cc9826043279bd46c41ac1
Merge branch 'vcloud_stemcell'

Conflicts:
	stemcell_builder/stages/system_parameters/apply.sh

Change-Id: I324a381ce703ce3ae14e5772e8a546a61f4386d1