Add ip a cant cat /etc/hosts as a commont logic.

.travis.yml

@@ -71,7 +71,6 @@ env:
     before_install:
       - |-
         bash -cx "${BEFORE_INSTALL}"
-      - grep '#define OPT_SUPPORT_JOKE' vm_opts.h
       - tool/travis_retry.sh sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - tool/travis_retry.sh sudo bash -c "rm -rf '${TRAVIS_ROOT}/var/lib/apt/lists/'* && exec apt-get update -yq"
       - |-
@@ -458,6 +457,8 @@ before_script:
   - echo JOBS=${JOBS} SETARCH=${SETARCH}
   - $SETARCH uname -a
   - $SETARCH uname -r
+  - ip a
+  - cat /etc/hosts
   - rm -fr .ext autom4te.cache
   - echo $TERM
   - |-