Stop installing groupmems(8)

Given this never worked, and other distros seem to do fine without this
tool, let's stop shipping it.

Closes: #1004472

debian/not-installed

@@ -17,6 +17,7 @@ etc/pam.d/usermod
 usr/bin/faillog
 usr/bin/sg
 usr/lib/*/libsubid.la
+usr/sbin/groupmems
 usr/sbin/logoutd
 usr/sbin/vigr
 usr/share/man/*/man1/groups.1
@@ -27,7 +28,9 @@ usr/share/man/*/man3/shadow.3
 usr/share/man/*/man5/faillog.5
 usr/share/man/*/man5/suauth.5
 usr/share/man/*/man8/faillog.8
+usr/share/man/*/man8/groupmems.8
 usr/share/man/*/man8/logoutd.8
+usr/share/man/man8/groupmems.8
 usr/share/man/man1/groups.1
 usr/share/man/man1/logoutd.1
 usr/share/man/man1/su.1

debian/passwd.install

@@ -11,7 +11,6 @@ usr/sbin/chpasswd
 usr/sbin/cppw
 usr/sbin/groupadd
 usr/sbin/groupdel
-usr/sbin/groupmems
 usr/sbin/groupmod
 usr/sbin/grpck
 usr/sbin/grpconv

debian/passwd.manpages

@@ -15,7 +15,6 @@ usr/share/man/*/man8/chgpasswd.8
 usr/share/man/*/man8/chpasswd.8
 usr/share/man/*/man8/groupadd.8
 usr/share/man/*/man8/groupdel.8
-usr/share/man/*/man8/groupmems.8
 usr/share/man/*/man8/groupmod.8
 usr/share/man/*/man8/grpck.8
 usr/share/man/*/man8/grpconv.8
@@ -45,7 +44,6 @@ usr/share/man/man8/chgpasswd.8
 usr/share/man/man8/chpasswd.8
 usr/share/man/man8/groupadd.8
 usr/share/man/man8/groupdel.8
-usr/share/man/man8/groupmems.8
 usr/share/man/man8/groupmod.8
 usr/share/man/man8/grpck.8
 usr/share/man/man8/grpconv.8