ci: Remove Travis CI

Since we now use Cirrus CI for macOS jobs, we no longer need to
keep Travis CI around.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

.travis.yml

-language: c
-compiler: clang
-os: osx
-
-branches:
-  except:
-    - /^.*-maint$/
-
-addons:
-  homebrew:
-    update: true
-    packages:
-      - ccache
-      - rpcgen
-      - xz
-      - yajl
-      - glib
-      - docutils
-      - gnutls
-
-matrix:
-  include:
-    - osx_image: xcode11.3
-    - osx_image: xcode10.3
-
-env:
-  global:
-    - PATH="/usr/local/opt/gettext/bin:/usr/local/opt/ccache/libexec:/usr/local/opt/rpcgen/bin:$PATH"
-    - PKG_CONFIG_PATH="/usr/local/opt/libxml2/lib/pkgconfig"
-
-before_script:
-  # Hack to blow away py2
-  - brew link --overwrite python
-
-script:
-  # We can't run 'distcheck' or 'syntax-check' because they fail on
-  # macOS, but doing 'install' and 'dist' gives us some useful coverage
-  - mkdir build && cd build
-  - ../autogen.sh --prefix=$(pwd)/install-root && make -j3 && make -j3 install && make -j3 dist
-
-git:
-  submodules: true
-
-notifications:
-  irc:
-    # The channel name "irc.oftc.net#virt" is encrypted against libvirt/libvirt
-    # to prevent IRC notifications from github forks. This was created using:
-    # $ travis encrypt -r "libvirt/libvirt" "irc.oftc.net#virt"
-    channels:
-      - secure: "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"
-    on_success: change
-    on_failure: always
-  email:
-    # The list name 'libvirt-ci@redhat.com" is encrypted against libvirt/libvirt
-    # to prevent IRC notifications from github forks. This was created using:
-    # $ travis encrypt -r "libvirt/libvirt" "libvirt-ci@redhat.com"
-    recipients:
-      - secure: "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"