Added test contains-rex

contains-rex : contains regular expression based on ics:regex

This permits tests along the lines of:

iterate /fabric/aliases/interconnect-device {
    contains-rex item-alias, "qf[1-2]-ic[1-4]" {
        info Checking Interconnect-Device Aliases;
    	    err "Found Interconnect-Device %s item-alias %s which is not expected!",name,item-alias;
    }
}