Remove Docker installation from build script

Installation of Docker is removed from build script because it is done
in the not very reliable way and can fail and cause build failure.
E.g. this installation causes conflict with existing Docker.

BUILD/install_build_deps.sh

@@ -131,14 +131,6 @@ then
 
         # Enable it by default
         echo "source /opt/rh/devtoolset-7/enable" >> ~/.bashrc
-    else
-        # Installed for REST API and MaxCtrl unit tests
-        sudo yum -y install docker epel-release
-        sudo yum -y install docker-compose
-        sudo groupadd docker
-        sudo usermod -a -G docker `whoami`
-        sudo sed -i 's/--selinux-enabled/--selinux-enabled=false/' /etc/sysconfig/docker
-        sudo systemctl start docker
     fi
 fi