rm kernel package from travis setup

Author: yomguy

.travis.yml

@@ -14,7 +14,7 @@ env:
 
 # Install TimeSide
 install:
-  - sudo apt-get install -y linux-image-virtual kernel linux-image-extra-virtual
+  - sudo apt-get install -y linux-image-virtual linux-image-extra-virtual
   - curl -sSL https://get.docker.com/ | sudo sh
   - sudo pip install docker-compose
   #- pip install --upgrade pip