Memory leakage + upgrade packages with vulnerabilities + support for running requests one time before start of test#482

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DinaYakovlev wants to merge 2 commits intoartilleryio:mainfrom DinaYakovlev:master

+264-295

Commits on Jul 8, 2018

1. Add the option to create request that run once before test 2. Fix vulnerabilities 3. remove entries from aggregate data
Dina Yakovlev
committed

Commits on Dec 23, 2018

sync to master
Dina Yakovlev
committed