[TASK] Decrease session GC probability to 1% (was 30%)
[TASK] Decrease session GC probability to 1% (was 30%)

Garbage collection of expired sessions should occur less often since
it's trigger for every third request right now on average. A 1% value
matches the PHP default value and should be sufficient for most setups.

Change-Id: I6d8cf83b6369ec8e23075bcd29fe4ba42fc9c496
Resolves: FLOW-146
Releases: 3.0, master
Original-Commit-Hash: c253748c04e7e0c32ba95a14243a835ab24c5e07

aertmann/flow-development-collection,dlubitz/flow-development-collection,dfeyer/flow-development-collection,daniellienert/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,kitsunet/flow-development-collection,mkeitsch/flow-development-collection,gerhard-boden/flow-development-collection,neos/flow-development-collection,dfeyer/flow-development-collection,fcool/flow-development-collection,kdambekalns/flow-development-collection,chewbakartik/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,kdambekalns/flow-development-collection,daniellienert/flow-development-collection,dfeyer/flow-development-collection,gerhard-boden/flow-development-collection,robertlemke/flow-development-collection,neos/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,dlubitz/flow-development-collection,mkeitsch/flow-development-collection,kitsunet/flow-development-collection,kitsunet/flow-development-collection,albe/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,mkeitsch/flow-development-collection,gerhard-boden/flow-development-collection,bwaidelich/flow-development-collection,kdambekalns/flow-development-collection,aertmann/flow-development-collection,aertmann/flow-development-collection,chewbakartik/flow-development-collection,dlubitz/flow-development-collection,fcool/flow-development-collection,kdambekalns/flow-development-collection,albe/flow-development-collection,daniellienert/flow-development-collection,dfeyer/flow-development-collection,robertlemke/flow-development-collection,neos/flow-development-collection