Move key_event_form.py to qemu/deps/spice/

Move to pyGtk from wxPython and also move to new
location from virt/shared/scripts to qemu/deps/spice/

Reviewed by: Swapna Krishnan <skrishna@redhat.com>
Use new location of key_event_form.py

Use new location of key_event_form.py in qemu/deps/spice/
and other minor fixes.

Reviewed by: Swapna Krishnan <skrishna@redhat.com>
Merge pull request #204 from swapnakrishnan2k/wxPython_to_pygtk_key_event_form

Update rv_input.py to use new key_event_form.py