Various changes to improve Clovisor:

Various changes to improve Clovisor:

1.) make clovisor work on GKE
2.) running more efficient correlation between k8s service, pods, and
service port name for the pod's container port
3.) add per session trace metrics on Clovisor's traces, including
request and response sizes, trace-id, request-id, and more HTTP header
fields
4.) improve eBPF code to account for TCP sessions which do not finish with
either FIN or RST flags
5.) tested with Clover sample app (the "SDC")

Change-Id: Ia1a6275caf31a63fb1288c93cea42b32a4606307
Signed-off-by: Stephen Wong <stephen.kf.wong@gmail.com>