travis: install requirements via apt

.travis.yml

@@ -1,65 +1,76 @@
 ---
 dist: bionic
-install:
-  - sudo apt-get update
-  - sudo apt-get --no-install-recommends install devscripts python python3 ruby php-cli gawk ksh zsh pylint shellcheck
-  - sudo apt-get --no-install-recommends install pkg-config libdb-dev libvirt-dev libexpat-dev
-  # - Munin/Plugin.pm is in "munin-node" on precise
-  - sudo apt-get --no-install-recommends install munin-node
-  - sudo apt-get --no-install-recommends install libsys-virt-perl
+addons:
+  apt:
+    packages:
+      - devscripts
+      - python
+      - python3
+      - ruby
+      - php5-cli
+      - gawk
+      - ksh
+      - zsh
+      - pylint
+      - shellcheck
+      - pkg-config
+      - libdb-dev
+      - libvirt-dev
+      - libexpat-dev
 
-  # we use locally installed cpan modules instead of travis' builtin 'homebrew' perl support
-  # The homebrew variation does not work for us, since:
-  #   * it is built without threading
-  #   * the 'libvirt' plugin requires Sys::Virt, which is not available via cpan anymore - thus we need to install the Debian package 'libsys-virt-perl', which was built with threading
+      # Munin/Plugin.pm is in "munin-node" on precise
+      - munin-node
+
+      # Modules used by test script
+      - libsys-virt-perl
+      - libcapture-tiny-perl
+
+      # Modules used by plugins
+      - libberkeleydb-perl
+      - libcache-memcached-perl
+      - libgraphics-colornames-www-perl
+      - libdbd-pg-perl
+      - libdata-dump-perl
+      - libdate-manip-perl
+      - libdatetime-format-iso8601-perl
+      - libdevice-serialport-perl
+      - libfile-readbackwards-perl
+      - libgraphics-colorobject-perl
+      - libipc-run3-perl
+      - libipc-sharelite-perl
+      - libjson-perl
+      - libjson-any-perl
+      - libmail-sendmail-perl
+      - libmodern-perl-perl
+      - libmoosex-poe-perl
+      - libnet-dns-perl
+      - libnet-openssh-perl
+      - libnet-snmp-perl
+      - libnet-telnet-perl
+      - libnet-telnet-cisco-perl
+      - libpoe-perl
+      - libproc-processtable-perl
+      - libredis-perl
+      - libswitch-perl
+      - libtext-iconv-perl
+      - libwww-mechanize-treebuilder-perl
+      - libyaml-perl
+      - libxml-libxml-perl
+      - libxml-simple-perl
+      - libxml-smart-perl
+      - libxml-twig-perl
+      - libexperimental-perl
+
+before_install:
   - cpanm --local-lib=~/perl5 local::lib && eval $(perl -I ~/perl5/lib/perl5/ -Mlocal::lib)
-
-  # Modules used by test script
-  - cpanm --notest Capture::Tiny
   - cpanm --notest File::Find
   - cpanm --notest Test::More
-
-  # Modules used by plugins
+  # more Modules used by plugins
   - cpanm --notest Asterisk::AMI
-  - cpanm --notest BerkeleyDB
-  - cpanm --notest Cache::Memcached
-  - cpanm --notest DBD::Pg
-  - cpanm --notest Data::Dump
-  - cpanm --notest Date::Manip
   - cpanm --notest Date::Parse
-  - cpanm --notest DateTime::Format::ISO8601
-  - cpanm --notest Device::SerialPort
   - cpanm --notest FCGI::Client
-  - cpanm --notest File::ReadBackwards
-  - cpanm --notest Graphics::ColorObject
-  - cpanm --notest Graphics::ColorNames::HTML
-  - cpanm --notest Graphics::ColorNames::Windows
-  - cpanm --notest IPC::Run3
-  - cpanm --notest IPC::ShareLite
-  - cpanm --notest JSON
-  - cpanm --notest JSON::Any
-  - cpanm --notest Mail::Sendmail
-  - cpanm --notest Modern::Perl
-  - cpanm --notest MooseX::POE
-  - cpanm --notest Net::DNS
-  - cpanm --notest Net::OpenSSH
-  - cpanm --notest Net::SNMP
-  - cpanm --notest Net::Telnet
-  - cpanm --notest Net::Telnet::Cisco
-  - cpanm --notest POE
   - cpanm --notest POE::Component::IRC
   - cpanm --notest POE::Quickie
-  - cpanm --notest Proc::ProcessTable
-  - cpanm --notest Redis
-  - cpanm --notest Switch
-  - cpanm --notest Text::Iconv
-  - cpanm --notest WWW::Mechanize::TreeBuilder
-  - cpanm --notest YAML
-  - cpanm --notest XML::LibXML
-  - cpanm --notest XML::Simple
-  - cpanm --notest XML::Smart
-  - cpanm --notest XML::Twig
-  - cpanm --notest experimental
   # Modules used bu plugins, but not compiling from CPAN
   # - cpanm --notest nvidia::ml
   # Modules used by plugins, but missing on cpan