Tizen: Export more wifi info in ConnMan network API

Network client requires additional wifi specific info

Export the BSSID property
Export the MaxRate property
Export the detailed info for encryption mode(mixed,aes,tkip,wep,none)

Export the connman_network get/set method for bssid, maxrate,
encryption_mode property
Tethering: Add station information management feature
Tethering: Add handling for wpa_supplicant authorized/deauthorized signals
Tizen: Append extra wifi service property

Append wifi property bssid, maxrate, frequency, encryptionmode to wifi
service
Tethering: Add interface that save lease in DHCP information
Tethering: Notify listeners when station connection changes
Tethering: Add open access point support in technology
Tethering: Add hidden access point support in technology
Tethering: Add test script of open and hidden AP
Tethering: Add tethering feature support in config file
Tethering: Optimize the interface between connman and mobileap-agent
Tethering: Add tethering interfaces description to technology-api.txt
enable client
[connman] add TIZEN_EXT define
fix compile
gsupplicant: Only add interface when wpa_supplicant is in ready state

I noticed following scenario:
- hardblock the device
- turn on offline mode
- turn off hardblock, as offline mode is still on connman will
  set softblock on
- wpa_supplicant generated these state signals in this order:
     1. INACTIVE
     2. DISABLED
- wifi.c cannot handle these events because the wifi pointer
  is NULL at this point
- gsupplicant will then call wifi.c:interface_added(), this will cause
  the scanning to start but that will fail because we are still
  in softblocked state (wpa_supplicant returns error)
- wifi.c goes now to forever loop i.e., it tries to start scan
  constantly. Only way to recover is to unblock wifi by turning
  offline mode off.

The fix to this issue is simple, if the interface is not yet ready
then gsupplicant will not call wifi.c:interface_added() callback as
that is useless anyway.

Upstream commit id:70445458847721186622677e2810febbf2f2f454
[connman] fix compile