qemuProcessQMPInit: Use long options for '-qmp' when probing qemu.
qemuProcessQMPInit: Use long options for '-qmp' when probing qemu.

'-qmp' in this case behaves the same as '-chardev' so it should have
been converted the same way as others were in 43c9c0859f2d53321 since
short options are deprecated.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,crobinso/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,libvirt/libvirt