Added the test cases for MP_FAIL, the multiple subflows test for the MP_RST
case and the single subflow one for the infinite mapping case.

Added a new function reset_with_fail(), in it use 'iptables' and 'tc
action pedit' commands to trigger the checksum failures.

Added a new global variable pedit_action to trace whether the tc pedit
action happened during the test. Check and set it in the new function
pedit_action_happened(). Show it in the test description and pass it to
chk_join_nr() to check the numbers of the checksum failures, MP_FAIL
sending and receiving, the infinite mapping sending and receiving.

Added a new global variable validate_checksum to enable checksums for
the MP_FAIL tests without passing the '-C' argument.

Also added the tests needed kernel configures in the config file.

Suggested-by: Davide Caratti <[email protected]>
Co-developed-by: Matthieu Baerts <[email protected]>
Signed-off-by: Matthieu Baerts <[email protected]>
Signed-off-by: Geliang Tang <[email protected]>
Message-Id: <0402469dc9a18e8db24fb5c2e87a8af43aec6c6c.1644381932.git.geliang.tang@suse.com>