header is changed
previously, data packet and control message is differentiated
by the first byte. But it can be collide in some cases.
Now the first byte is version and the second byte is message type.
switchmode
Merge remote-tracking branch 'upstream/master' into header

Conflicts:
	src/gvpn_controller.py
	src/ipoplib.py
ipop switchmode
switchmode
removed unnecessary file
Adding watchdog.py
Merge pull request #6 from ptony82/fix/add-watchdog

Adding watchdog.py
functions converting string to binary is changed

 - make_arp / send_packet separated
 - bugfix "local" field in arp_table
Merge pull request #4 from kyuhojeong/header

ARP handle
Adding call to set trim policy
Merge pull request #8 from ptony82/feature/trim_policy

Adding call to set trim policy
Sets get_state stats false for socialvpn
Merge pull request #10 from ptony82/fix/disable_stats_svpn

Sets get_state stats false for socialvpn
multihop
comment message
multihop
Merge pull request #11 from kyuhojeong/multihop

Multihop
Merge remote-tracking branch 'upstream/devel' into devel
For the windows watch dog, echo request and reply message is added