Simplify and generalize SERVER_IP detection

[Joe Garcia]

cicd/bin/0_install_systems.sh

Line 8 in 783e3fd

 export server_ip=$(ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'|grep -v 172*) 

An easier and more effective way of doing this is:

hostname -I | awk '{print $1}'

I have ran into issues in certain VM environments and in AWS using the current method that was resolved globally by making this change.