rpc: replacing ssh_get_publickey() by ssh_get_server_publickey().
rpc: replacing ssh_get_publickey() by ssh_get_server_publickey().

After version 0.7.5, libssh deprecated the function scope
ssh_get_publickey() and moved to ssh_get_server_publickey(). So, Libvirt
is failing to compile using this new function name.

Signed-off-by: Julio Faracco <a9e27ab562b8d02c0041eb70cde6fe3858219fb7@gmail.com>
Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,olafhering/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,jardasgit/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,olafhering/libvirt,crobinso/libvirt,olafhering/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,zippy2/libvirt,zippy2/libvirt,jfehlig/libvirt,jardasgit/libvirt,zippy2/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt