Adding mixed cluster, rolling upgrade, restart upgrade bwc tests#158

Merged

saratvemulapalli merged 3 commits intoopensearch-project:mainfrom VachaShah:bwc_tests_support

Aug 12, 2021

+487-139

Commits on Aug 5, 2021

Adding mixed cluster bwc tests
VachaShah
committed

Commits on Aug 11, 2021

Adding anomaly detector assertions for bwc
VachaShah
committed

Commits on Aug 12, 2021

Adding rolling upgrade and full restart upgrade bwc tests
VachaShah
committed