We currently have a "magic" code which select the OS Type in oVirt. It tries to detect OS name and version, but user has no option to opt-in for specific type.

This patch will add ovirt_ostype host parameter reading, when present it overrides the detection completely.

Example list of supported OS types from oVirt 3.x series:

rhel_6,rhel_6x64,rhel_6_ppc64,rhel_3,rhel_4,rhel_5,rhel_7x64,rhel_3x64,rhel_4x64,rhel_5x64,rhel_7_ppc64,ubuntu_14_04,sles_11,ubuntu_12_04,ubuntu_12_10,ubuntu_13_04,ubuntu_13_10,windows_10,windows_10x64,windows_2012R2x64,windows_2012x64,sles_11_ppc64,windows_8,ubuntu_14_04_ppc64,windows_8x64,other_linux_ppc64,windows_2008x64,other_ppc64,windows_2008R2x64,debian_7,windows_7x64,freebsdx64,windows_7,freebsd,windows_2003x64,other_linux,windows_2008,windows_2003,windows_xp,other