storagepoolxml2argvtest: Fix output data for 'pool-netfs-protocol-ver'

The storage pool tests have host-specific versions which I neglected to
update in commit c44930d932 thus breaking
the test-suite on non-linux OSes.

Fixes: c44930d932
Signed-off-by: Peter Krempa <pkrempa@redhat.com>

tests/storagepoolxml2argvdata/pool-netfs-protocol-ver-freebsd.argv

@@ -1,5 +1,5 @@
 mount \
--o nosuid,noexec,nfsvers=3 \
+-o nosuid,noexec,nfsvers=4.1 \
 -t nfs \
 localhost:/var/lib/libvirt/images \
 /mnt

tests/storagepoolxml2argvdata/pool-netfs-protocol-ver.argv

@@ -1,5 +1,5 @@
 mount \
--o nfsvers=3 \
+-o nfsvers=4.1 \
 -t nfs \
 localhost:/var/lib/libvirt/images \
 /mnt