Enable include_initial in changefeed squash tests.
Enable include_initial in changefeed squash tests.

OTS reviewed by @vexocide.

Qinusty/rethinkdb,bchavez/rethinkdb,mbroadst/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,jmptrader/rethinkdb,grandquista/rethinkdb,catroot/rethinkdb,niieani/rethinkdb,JackieXie168/rethinkdb,bpradipt/rethinkdb,JackieXie168/rethinkdb,bchavez/rethinkdb,dparnell/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,eliangidoni/rethinkdb,catroot/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,niieani/rethinkdb,catroot/rethinkdb,JackieXie168/rethinkdb,jmptrader/rethinkdb,dparnell/rethinkdb,catroot/rethinkdb,robertjpayne/rethinkdb,Qinusty/rethinkdb,eliangidoni/rethinkdb,bchavez/rethinkdb,robertjpayne/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,jmptrader/rethinkdb,eliangidoni/rethinkdb,bchavez/rethinkdb,Qinusty/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,dparnell/rethinkdb,niieani/rethinkdb,grandquista/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,catroot/rethinkdb,bchavez/rethinkdb,Qinusty/rethinkdb,eliangidoni/rethinkdb,bchavez/rethinkdb,mbroadst/rethinkdb,bpradipt/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,bpradipt/rethinkdb,eliangidoni/rethinkdb,grandquista/rethinkdb,JackieXie168/rethinkdb,JackieXie168/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,robertjpayne/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,catroot/rethinkdb,Qinusty/rethinkdb,eliangidoni/rethinkdb,robertjpayne/rethinkdb,mbroadst/rethinkdb,dparnell/rethinkdb,bchavez/rethinkdb,JackieXie168/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,JackieXie168/rethinkdb,dparnell/rethinkdb,dparnell/rethinkdb,eliangidoni/rethinkdb,robertjpayne/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,niieani/rethinkdb,eliangidoni/rethinkdb,robertjpayne/rethinkdb,Qinusty/rethinkdb,robertjpayne/rethinkdb,mbroadst/rethinkdb,bpradipt/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,robertjpayne/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,jmptrader/rethinkdb