Defer to doc/getting_started.* for specific instructions
Add glibc-static to list of required CentOS packages.

[finishes #48447409]
adding configurable mtu of container interface
adding config parsing check and export mtu in base class
Merge branch 'doc'

Conflicts:
	warden/README.md
changing default value to 1500 and some small tweaks
Merge pull request #26 from anynines/add_mtu_config_for_warden_container_interface

Add mtu config for warden container interface
Add test for MTU config
Add links to cgroups docs

[#54261180]
Add testing instructions
Add contributing guide