tests: increase sleeps from 1s to 2s

tests: increase sleeps from 1s to 2s

The issue here is that some of the tests sporadically fail due to things
being still processed. Default 1s delays proven not to be sufficient for
newly created CI, as tests tend to ocassionally fail.

This patch increases default 1s sleep to 2s, to hopefully get rid of
sporadical fails.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>