Add agent inspection support for IPMI and SSH drivers
Add agent inspection support for IPMI and SSH drivers

Previously pxe_ssh and pxe_ipmitool were the only way to inspect
a host utilizing ssh or ipmitool. With this patch, it extends the
ability for a user to call for inspection of nodes utilizing agent
drivers.

Change-Id: I27caa1122a72ac655958b7a6aa14b7566964f998

bacaldwell/ironic,hpproliant/ironic,SauloAislan/ironic,dims/ironic,bacaldwell/ironic,ionutbalutoiu/ironic,dims/ironic,pshchelo/ironic,openstack/ironic,ionutbalutoiu/ironic,pshchelo/ironic,devananda/ironic,NaohiroTamura/ironic,NaohiroTamura/ironic,SauloAislan/ironic,openstack/ironic