Merge pull request #43 from 'hotfixes-v2.26'

fix: for iterating through list and modifying it in the same loop
`test_read_from_groups` was updated for elliptics v2.26
Compatibility tests were updated for v2.26.
Merge pull request #45 from 'features/timeouts-tests-update'

`test_read_from_groups` was updated for elliptics v2.26
Configuration file for compatibility tests was updated.
Merge branch 'v2.26' into features/compatibility-tests-update
Merge pull request #46 from 'features/compatibility-tests-update'

Compatibility tests were updated for v2.26.
Merge branch 'v2.26' into hotfixes-v2.26