Automated cherry pick of #6050: Fix wrong TCP flags validation (#6050)

[gran-vmv]

Cherry pick of #6050 on release-1.13.

#6050: Fix wrong TCP flags validation (#6050)

For details on the cherry pick process, see the cherry pick requests page.

[tnqn]

LGTM

[tnqn]

/skip-all

[tnqn]

@gran-vmv The username you used in gitconfig is "Ran Gu" while the username you used in "Signed-off-by" is "gran", did you sign off the commit manually, as opposed to using -s? The difference caused DCO check to not pass for backport PRs (I don't know why the original PR didn't fail). Please amend these PRs to fix the check, and you should perhaps starting using -s to sign off commits in the future to avoid the inconvenience. Note that "Signed-off-by" normally expects full name instead of an ID.

[gran-vmv]

@gran-vmv The username you used in gitconfig is "Ran Gu" while the username you used in "Signed-off-by" is "gran", did you sign off the commit manually, as opposed to using -s? The difference caused DCO check to not pass for backport PRs (I don't know why the original PR didn't fail). Please amend these PRs to fix the check, and you should perhaps starting using -s to sign off commits in the future to avoid the inconvenience. Note that "Signed-off-by" normally expects full name instead of an ID.

I generated these cherry-picks on another machine, and the gitconfig is not fully configured on that machine, thus we get DCO error.
Fixed the gitconfig and sign this commit again for these 3 PRs.

[gran-vmv]

Using "Signed-off-by: gran" as the commit in master has this.

[tnqn]

/skip-all