Bug#893595: autopkgtest doesn't handle long package names (>= 55 char) properly

[Paul Gevers]

Package: autopkgtest
Version: 5.1
Severity: normal
Control: affects -1 src:libmoosex-traitfor-meta-class-betteranonclassnames-perl
Control: affects -1 src:libcatalyst-authentication-credential-authen-simple-perl
Control: affects -1 src:libcatalyst-plugin-authentication-credential-openid-perl

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The test suite of libmoosex-traitfor-meta-class-betteranonclassnames-perl
fails with the following error:
node name 'libmoosex-traitfor-meta-class-betteranonclassnames-perl-1521522524' is too long

Full log¹:
autopkgtest [05:08:44]: version 5.1~bpo9+1
autopkgtest [05:08:44]: host ci-worker02.debian.net; command line: /usr/bin/autopkgtest --no-built-binaries --user debci --apt-upgrade --output-dir /tmp/tmp.ErSTOr98tA/autopkgtest-incoming/unstable/amd64/libm/libmoosex-traitfor-meta-class-betteranonclassnames-perl/30637 libmoosex-traitfor-meta-class-betteranonclassnames-perl -- lxc --sudo --name libmoosex-traitfor-meta-class-betteranonclassnames-perl-1521522524 autopkgtest-unstable-amd64
lxc-copy: confile.c: config_utsname: 1927 node name 'libmoosex-traitfor-meta-class-betteranonclassnames-perl-1521522524' is too long
lxc-copy: lxccontainer.c: do_lxcapi_clone: 3163 Error setting new hostname
clone failed
<VirtSubproc>: failure: lxc-copy with exit status 1
autopkgtest [05:08:46]: ERROR: testbed failure: cannot send to testbed: [Errno 32] Broken pipe

¹ https://ci.debian.net/data/autopkgtest/unstable/amd64/libm/libmoosex-traitfor-meta-class-betteranonclassnames-perl/30637/log.gz

- -- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing'), (200, 'testing'), (50, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages autopkgtest depends on:
ii  apt-utils       1.6~beta1
ii  libdpkg-perl    1.19.0.5
ii  procps          2:3.3.12-4
ii  python3         3.6.4-1
ii  python3-debian  0.1.32

Versions of packages autopkgtest recommends:
ii  autodep8  0.11.1

Versions of packages autopkgtest suggests:
ii  lxc          1:2.0.9-6
pn  lxd-client   <none>
pn  qemu-system  <none>
ii  qemu-utils   1:2.11+dfsg-1
ii  schroot      1.6.10-4

- -- no debconf information

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