CI: slightly more robust xfvb starting (pandas-dev#18239)

Author: jreback

.travis.yml

@@ -102,8 +102,6 @@ before_install:
   - uname -a
   - git --version
   - git tag
-  - ci/before_install_travis.sh
-  - export DISPLAY=":99.0"
 
 install:
   - echo "install start"
@@ -114,6 +112,8 @@ install:
 
 before_script:
   - ci/install_db_travis.sh
+  - export DISPLAY=":99.0"
+  - ci/before_script_travis.sh
 
 script:
   - echo "script start"

ci/before_install_travis.sh renamed to ci/before_script_travis.sh

@@ -4,6 +4,7 @@ echo "inside $0"
 
 if [ "${TRAVIS_OS_NAME}" == "linux" ]; then
    sh -e /etc/init.d/xvfb start
+   sleep 3
 fi
 
 # Never fail because bad things happened here.

pandas/tests/io/test_clipboard.py

@@ -18,7 +18,7 @@
 try:
     DataFrame({'A': [1, 2]}).to_clipboard()
     _DEPS_INSTALLED = 1
-except PyperclipException:
+except (PyperclipException, RuntimeError):
     _DEPS_INSTALLED = 0