Changes to Centos bootstrap to remove ~/git/vpp if it exists before attempting clone
Changes to Centos bootstrap to remove ~/git/vpp if it exists before attempting clone

- fixes issue with vagrant reload --provision not updating clone of clone

Change-Id: I506d4cbca90b30bf787c1be7e4ad39d748ea7f5b
Signed-off-by: Keith Burns (alagalah) <469d26a9115c63bc10d4323e29088530ee1e798d@gmail.com>

GabrielGanne/vpp-flowtable,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,muharif/vpp,vpp-dev/vpp,FDio/vpp,muharif/vpp,chrisy/vpp,muharif/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,milanlenco/vpp,milanlenco/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,FDio/vpp,muharif/vpp,chrisy/vpp,milanlenco/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,muharif/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,milanlenco/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,milanlenco/vpp,vpp-dev/vpp,chrisy/vpp,milanlenco/vpp,GabrielGanne/vpp-flowtable,muharif/vpp