Changes:
- Only use the cached supplementory group vector when matching groups
for the invoking user. (security)
- When setting the umask, use the union of the user's umask and the
default value set in sudoers so that we never lower the user's umask
when running a command.
- Sudo now operates in the C locale again when doing a match against
sudoers.
PR: 131446
Submitted by: Eygene Ryabinkin
Security: vid:13d6d997-f455-11dd-8516-001b77d09812
a2745142d5