[FIX] sap.m.Tokenizer, MultiInput, MultiComboBox - fix IOS8 scrolling

- bypass for IOS8 issue with nested scrolling
- code clean up

Change-Id: I932dbb56708b331b4cd1eab31fcb92a046905f19
CR-Id: 012003146900009323532014
Merge "[FIX] sap.m.Tokenizer, MultiInput, MultiComboBox - fix IOS8 scrolling" into rel-1.26