Bug#926305: nis startup scripts are completely broken

[Anton Ivanov <anton.ivanov@kot-begemot.co.uk>]

Package: nis
Version: 3.17.1-3+b1
Severity: critical
Justification: breaks unrelated software

Dear Maintainer,

Startup scripts are completely broken. Something in the systemd conversion/autogeneration.

The ypbind binary is never started, the script goes into "backgrounded" and fails. From there
on the system is unusable - you cannot log in, UIDs and groups do not resolve, etc.

The same system operated correctly before buster upgrade and will operate correctly if
ypbind is invoked from the command line.

This looks like a pure systemd conversion issue of some sort.

-- Package-specific info:

NIS domain: home 

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages nis depends on:
ii  debconf [debconf-2.0]  1.5.71
ii  hostname               3.21
ii  libc6                  2.28-8
ii  libgdbm6               1.18.1-4
ii  libsystemd0            241-1
ii  lsb-base               10.2019031300
ii  make                   4.2.1-1.2
ii  netbase                5.6
ii  rpcbind [portmap]      1.2.5-0.3

nis recommends no packages.

Versions of packages nis suggests:
pn  nscd  <none>

-- Configuration Files:
/etc/yp.conf changed [not included]

-- debconf information:
* nis/domain: home