test/common: Enable inherit_errexit

Do this to detect and trap failures inside subshell environments.
Without it, we simply fall through expecting the "upper" layer
of the test to handle the failure. If such handling is not
implemented we may miss some broken pieces along the test
suites, potentially creating false positives. Consider example:

  # [[ $(this_command_does_not_exist) -eq 0 ]]

Test should fail since clearly we cannot rely on calling something
that doesn't exist. In current setup, this would fall through;
inherit_errexit test would immediately abort it.

Change-Id: I7210138cf15bb90eb6b6519d3aa25fd25f54d6f2
Signed-off-by: Michal Berger <michal.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/23079


Reviewed-by: Jim Harris <jim.harris@samsung.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <ben@nvidia.com>