Bug#887899: overrides for dh_systemd_enable|start are silently ignored in compat 11

[Michael Biebl]

Package: debhelper
Version: 11.1.3
Severity: normal

I use the following in network-manager:

override_dh_systemd_start:
       dh_link -pnetwork-manager \
              lib/systemd/system/NetworkManager.service \
              lib/systemd/system/network-manager.service
       dh_systemd_start -pnetwork-manager --no-also NetworkManager.service

After switching to compat 11, that override was completely ignore. No
symlink was created and the parameters of dh_systemd_start were ignored
afaics.

If this is desired behaviour, dh should bail out, if there is an
override for dh_systemd_enable or dh_systemd_start in compat 11 and the
helpers itelf should bail out as well (in case they are used without dh)

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.14.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages debhelper depends on:
ii  autotools-dev            20171216.1
ii  binutils                 2.29.1-13
ii  dh-autoreconf            15
ii  dh-strip-nondeterminism  0.040-1
ii  dpkg                     1.19.0.5
ii  dpkg-dev                 1.19.0.5
ii  file                     1:5.32-1
ii  libdpkg-perl             1.19.0.5
ii  man-db                   2.7.6.1-4
ii  perl                     5.26.1-4
ii  po-debconf               1.0.20

debhelper recommends no packages.

Versions of packages debhelper suggests:
ii  dh-make  2.201701
pn  dwz      <none>

-- no debconf information