Small fixes (viper0131#33)

Add which package (viper0131#32)
Make update.sh executable (viper0131#31)

Author: mcgege

Dockerfile

@@ -24,7 +24,7 @@ ADD    update.sh /opt/
 EXPOSE 5000/tcp
 
 # retrieve and install the check mk binaries and its dependencies
-RUN yum install --nogpgcheck -y ssmtp https://mathias-kettner.de/support/${CMK_VERSION}/check-mk-raw-${CMK_VERSION}-el7-${CMK_DOWNLOADNR}.x86_64.rpm
+RUN yum install --nogpgcheck -y ssmtp which https://mathias-kettner.de/support/${CMK_VERSION}/check-mk-raw-${CMK_VERSION}-el7-${CMK_DOWNLOADNR}.x86_64.rpm
 
 # fake fstab
 RUN echo "# /etc/fstab" > /etc/fstab