Fail more elegantly in case of wifi connection failure

[fdgonthier]

Having the wrong credentials for the wifi network crashes the program pretty loudly without giving any hints that the authentication has failed.

I [IPCP_MANAGER]: ************* INIT RINA ***********
D [NetBuffer]: Initialized Buffers
I [EFCP]: EFCP container instance 0x3ffb9490 created
I [RMT]: Instance 0x3ffb9524K initialized successfully
I [SHIM_WIFI]: Instance Created: 0x3ffb9784, IPCP id:1
I [SHIM_WIFI]: Wifi shim initialization
I [SHIM_WIFI]: Enrolling to DIF
I [NetInterface]: Initializing the network interface
I [ARP]: MAC Address updated
I [SHIM_WIFI]: CREATE GPA address: 
I [SHIM_WIFI]: CREATE GPA size: 5
I [ARP]: ARP CACHE Initialized
I [NetInterface]: xNetworkInterfaceConnect
I [NetInterface]: Creating group
I [SHIM_WIFI]: Creating event Loop
I [SHIM_WIFI]: Init Network Interface with Config file
I [SHIM_WIFI]: Registering event handler
I [SHIM_WIFI]: Setting mode and starting wifi
I [NetInterface]: esp_wifi_starting as station
I [NetInterface]: wifi_init_sta finished, waiting for events...
Guru Meditation Error: Core  0 panic'ed (Unhandled debug exception). 
Debug exception reason: Stack canary watchpoint triggered (sys_evt) 
Core  0 register dump: