Note that this is the first part of the support. A second part involves
dealing with the package names.
Among the changes:
- add several functions to determine some distro-specific behavior (how
to call usermod, if some features are available on the distro, etc.)
- correctly detect openSUSE and SLE in GetOSVersion, and set DISTRO
accordingly
- new is_suse() function to check if running on a SUSE-based distro
- use zypper to install packages
- adapt apache virtual host configuration for openSUSE
- some simple fixes (path to pip, mysql service name)
Change-Id: Id2f7c9e18a1c4a7b7cea262ea7959d183e4b0cf0
856a11e0e4