Adding packages related to kexec-tools and making contrail-setup depends on kexec-tools if centos6.5

Change-Id: I3f2f8e68336f8e2f07ee1a4eeb071ed54d6a036b
Merge "Adding packages related to kexec-tools and making contrail-setup depends on kexec-tools if centos6.5" into R1.10