Cherry pick v20.03: fix(rollups): rollup a batch if more than 2 seconds elapsed since last batch (#6118)#6138

Merged

parasssh merged 1 commit intorelease/v20.03from paras/v2003_rollup_2s

Aug 4, 2020

+41-15

Commits on Aug 4, 2020

fix(rollups): rollup a batch if more than 2 seconds elapsed since last batch (#6118 )
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