bump to 1.11.5
bump to 1.11.5

Signed-off-by: Difan Zhao <d4b657a67385123ddb690ebdb0d79b9c6cd38927@pivotal.io>

CiscoCloud/PCF-Metapod,pivotal-cf-experimental/vm_shepherd,pivotal-cf-experimental/vm_shepherd,CiscoCloud/PCF-Metapod