core: os repository - remove "linux" and "windows"

"linux" and "windows" introduced to be the base oss but dosn't really
have a use as real OSs.

* remove linux and windows os from osinfo
* refactor each os which rely on linux and windows to rely on other_linux and windows_xp respectivly
* upgrade db records in vm_static.

* this change will break import/export but since this change introduced
 in 3.3 and is removed in 3.3 I'm not suppling handling in the code for
 that.

 to fix the import its enough to add to
 $PREFIX/etc/ovirt-engine/osinfo.conf.d/20-import-export-linux-windows-fix.properties

  20-import-export-linux-windows-fix.properties

  backwardCompatibility.linux = 5
  backwardCompatibility.windows = 1

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1009013
Change-Id: I9c32efc276fa32af39b35ce081a7bd2003afc129
Signed-off-by: Roy Golan <rgolan@redhat.com>