Merge pull request #2875 from paultbarham/azuremerge

Fix bug running as root and upgrading (with yum) WALinuxAgent

vsts-fullbuild-redhat-vm/scripts/full-rh-vstsbuild-install.sh

@@ -95,7 +95,7 @@ ln -s /usr/local/git/bin/git /usr/bin/git
 
 # Install Docker Engine and Docker Compose
 echo "Installing Docker Engine and Docker Compose" >> /home/$5/install.progress.txt
-yum update -y >> /home/$5/install.out.txt 2>&1
+yum update -y --exclude=WALinuxAgent >> /home/$5/install.out.txt 2>&1
 
 echo [dockerrepo] > /etc/yum.repos.d/docker.repo
 echo name=Docker Repository >> /etc/yum.repos.d/docker.repo