Revert "libvirt: force use of libssh2"
Revert "libvirt: force use of libssh2"

This reverts commit df0678b3c9c44aac9703dcf78ceb4fdbe8397f3e.

fbertux/meta-virtualization,cjp256/meta-virtualization,cjp256/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,rcwoolley/meta-virtualization,lgirdk/meta-virtualization,fbertux/meta-virtualization,cardoe/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,fbertux/meta-virtualization,lgirdk/meta-virtualization