Merge pull request #82 from rightscale/teal_13_09_acu109707_bump_agent_protocol_version_for_v5x9

acu109707 bump agent protocol version to 21 only to distinguish RightLink v5.9 from v5.8
acu109055 - Change stats manager timeout flag to -T to resolve conflict downstream
acu109055 - Improve flow of non-delivery information in request timeout situations
Merge pull request #84 from rightscale/cornsilk_13_9_acu109055_improve_router_retry

Cornsilk 13 9 acu109055 improve router retry