As a form of validation, it is a common practice to check the outputs
of commands whether they contain expected patterns or match a certain
regex.

Add helpers for verifying that all regexes are found in the output, that
all lines match any pattern from a set and that a certain expression is
not present in the output.

In verbose mode these helpers log mismatches for easier failure
investigation.
Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
Signed-off-by: Michael Petlan <mpetlan@redhat.com>
Cc: kjain@linux.ibm.com
Cc: atrajeev@linux.vnet.ibm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240215110231.15385-6-mpetlan@redhat.com