Merge "Change contrail-vrouter to contrail-vrouter-agent" into R1.10

get rid of param files

change "service contrail-vrouter" to "service contrail-vrouter-agent"

get rid of param files

bug fix for 1354579

bug fix for 1354581

remove all _pre files

Change-Id: I119292d2881452087f2c5fb9abc89acd8457a119