Count transaction limit towards the number of outstanding transactions instead of the number of incomplete transactions.
Count transaction limit towards the number of outstanding transactions
instead of the number of incomplete transactions.

Session grouping mode could grab an unintended amount of memory
because the transaction limit was counted towards the incomplete
rather that not yet reported transactions. A long lasting session
would only count as 1 towards the limit even if it had thousands of
complete children that should put it above the limit.

feld/Varnish-Cache,franciscovg/Varnish-Cache,mrhmouse/Varnish-Cache,zhoualbeart/Varnish-Cache,gquintard/Varnish-Cache,chrismoulton/Varnish-Cache,mrhmouse/Varnish-Cache,chrismoulton/Varnish-Cache,gquintard/Varnish-Cache,ajasty-cavium/Varnish-Cache,franciscovg/Varnish-Cache,feld/Varnish-Cache,mrhmouse/Varnish-Cache,franciscovg/Varnish-Cache,alarky/varnish-cache-doc-ja,gquintard/Varnish-Cache,zhoualbeart/Varnish-Cache,gauthier-delacroix/Varnish-Cache,alarky/varnish-cache-doc-ja,varnish/Varnish-Cache,zhoualbeart/Varnish-Cache,franciscovg/Varnish-Cache,franciscovg/Varnish-Cache,mrhmouse/Varnish-Cache,varnish/Varnish-Cache,alarky/varnish-cache-doc-ja,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,gauthier-delacroix/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,chrismoulton/Varnish-Cache,chrismoulton/Varnish-Cache,zhoualbeart/Varnish-Cache,alarky/varnish-cache-doc-ja,mrhmouse/Varnish-Cache,ajasty-cavium/Varnish-Cache,chrismoulton/Varnish-Cache,alarky/varnish-cache-doc-ja,gquintard/Varnish-Cache,gauthier-delacroix/Varnish-Cache,zhoualbeart/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gauthier-delacroix/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache