CI debug (pandas-dev#27542)

* pytest-xdist?

* pytest 4.x

* Remove deprecated container base

* remove matplotlib from travis workers

Author: TomAugspurger

.travis.yml

@@ -1,4 +1,3 @@
-sudo: false
 language: python
 python: 3.5
 

ci/deps/azure-36-locale.yaml

@@ -7,7 +7,6 @@ dependencies:
   - bottleneck=1.2.*
   - cython=0.28.2
   - lxml
-  - matplotlib=2.2.2
   - numpy=1.14.*
   - openpyxl=2.4.8
   - python-dateutil

ci/deps/travis-36-cov.yaml

@@ -11,7 +11,6 @@ dependencies:
   - gcsfs
   - geopandas
   - html5lib
-  - matplotlib
   - moto
   - nomkl
   - numexpr
@@ -39,8 +38,8 @@ dependencies:
   - xlsxwriter
   - xlwt
   # universal
-  - pytest>=4.0.2
-  - pytest-xdist
+  - pytest>=4.0.2,<5.0.0
+  - pytest-xdist==1.28.0
   - pytest-cov
   - pytest-mock
   - hypothesis>=3.58.0

ci/deps/travis-36-locale.yaml

@@ -35,7 +35,7 @@ dependencies:
   - xlwt
   # universal
   - pytest>=4.0.2
-  - pytest-xdist
+  - pytest-xdist>=1.29.0
   - pytest-mock
   - pip
   - pip: