Include LDAP groups in local spawner gids

[uellue]

The original code only returns local groups, at least with a Kerberos and LDAP setup with CentOS 7. The new code matches what id returns on that system.

Quick test script:

import os
import grp
import pwd

username = "weber"
user =  pwd.getpwnam(username)
gid = user.pw_gid
old_gids = [g.gr_gid for g in grp.getgrall() if username in g.gr_mem]
new_gids = os.getgrouplist(username, gid)

print("old", old_gids)
print("new", new_gids)

(jupyterhub311) [weber@iff588 ~]$ id
uid=20335(weber) gid=68100(erc-1) groups=68100(erc-1),680(iff_ms),975(docker),1020(iff),68000(pgi-5)
(jupyterhub311) [weber@iff588 ~]$ python3 grouplist.py
old [975]
new [68100, 975, 68000, 1020, 680]

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[minrk]

Nice, thanks!

[minrk]

@meeseeksdev please backport to 4.x