Squashed commit of the following: Last minute clean-up libs/libc/grp/lib_find_grpfile.c: Fix some problems found in testing. libs/libc/pwd: Finishes off implementation using /etc/passwd. libs/libc/grp: Finishes off implementation using /etc/group. libs/libc/pwd/lib_find_pwdfile.c: Add logic to look up user information in /etc/passwd file, if available. libs/libc/grp/lib_find_grpfile.c: Add logic to look up group information in /etc/group file, if available.