enable sherlock write in ceilometer

Detailed shelrock endpoint for ebay & paypal:
ebay MP: sherlock://sherlock-ftr-mp-phx.vip.ebay.com:80?tenant=mp&env=prod&app_svc=c3-metrics&profile=c3-metrics&maxsize=10000&timeout=30.0&log_level=2

Paypal PHX: sherlock://frontierproxy-vip.phx.paypal.com:80?tenant=pp&env=prod&app_svc=c3-metrics&profile=c3-metrics&maxsize=10000&timeout=30.0&log_level=2

Paypal SLC-A: sherlock://frontierproxy-vip-a.slc.paypal.com:80?tenant=pp&env=prod&app_svc=c3-metrics&profile=c3-metrics&maxsize=10000&timeout=30.0&log_level=2

Paypal SLC-B: sherlock://frontierproxy-vip-b.slc.paypal.com:80?tenant=pp&env=prod&app_svc=c3-metrics&profile=c3-metrics&maxsize=10000&timeout=30.0&log_level=2
use subprocess to invoke sherlock frontier to send metrics request
remove unused gevent.pool
remve unused gevent pool
fix compliant error
redirect infra log to target log file
refine sub process, only when frontier's queue is empty ,then terminate subprocess & use gevent to run sub process
after pythonIfra team fix issue[213] to support absolute path for log file,use log file from config
use frontier.writes_done.wait() instead of polling fonrtier _wq is empty
pass more parmas to sub process to initiate sherlock python infra
add more comment & confirm bug fix for https://github.paypal.com/Python/PythonInfrastructure/issues/214
remove ca generator script
add one monitor script
add sherlock-based conf & enhance monitor script
use pythonInfra's app_svc