travis: use included configs, drop R4.0 dom0 test

.travis.yml

@@ -1,23 +1,4 @@
-sudo: required
-dist: bionic
-language: python
-python:
-  - '3.5'
-install:
- - pip install --quiet -r ci/requirements.txt
- - git clone https://github.com/QubesOS/qubes-builder ~/qubes-builder
-script:
- - PYTHONPATH=test-packages pylint --rcfile=ci/pylintrc qubesmanager
- - ~/qubes-builder/scripts/travis-build
-env:
- - DIST_DOM0=fc25 USE_QUBES_REPO_VERSION=4.0 USE_QUBES_REPO_TESTING=1
- - DIST_DOM0=fc31 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=fc30 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=fc31 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=centos7 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
-
-# don't build tags which are meant for code signing only
-branches:
-  except:
-    - /.*_.*/
-    - build
+import:
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-base-r4.1.yml
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-dom0-r4.1.yml
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-vms-rpm-r4.1.yml