add htparse keepalive tests
add htparse keepalive tests

Change-Id: I0d04ca77f05678fa5f7e04a7b1089a695bf4dfda
Reviewed-on: http://review.couchbase.org/43386
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>
Reviewed-by: Subhashni Balakrishnan <7129c8e37b832c7bd362ff375532d24b98ef5162@gmail.com>

mnunberg/libcouchbase,PureSwift/libcouchbase,mody/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,mnunberg/libcouchbase,senthilkumaranb/libcouchbase,mnunberg/libcouchbase,mnunberg/libcouchbase,signmotion/libcouchbase,PureSwift/libcouchbase,couchbase/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,mnunberg/libcouchbase,senthilkumaranb/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,maxim-ky/libcouchbase,maxim-ky/libcouchbase,kojiromike/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase