Build separate Install Guides for Ubuntu and Debian

Change-Id: If304db242074dc46537f6f52e25ed642cf46ab32
backport: havana
(cherry picked from commit 316871174e02755eb4db3b1dead1c4187f92807c)
Install Guide: Start Neutron Services at Boot

This commit adds `chkconfig` commands to start Neutron services at boot.

Change-Id: I45d26a2484c04d521740cdd8da46441627d94403
Fixes: bug #1243929
(cherry picked from commit a93e2c08f3b52fc5ebe2e47ceda699b5fa7ce032)
Merge "Build separate Install Guides for Ubuntu and Debian" into stable/havana
Merge "Install Guide: Start Neutron Services at Boot" into stable/havana