wpa_cli: Use eloop during connection attempts in interactive mode

wpa_cli: Use eloop during connection attempts in interactive mode

This changes the call flow to allow full eloop operations to be used
while waiting for wpa_cli to establish a connection to wpa_supplicant in
the beginning of an interactive session. This allows the cleanup steps
to be more consistent and avoid debugging issues due to unfreed memory
or other resources if wpa_cli is killed with Ctrl-c.

Signed-hostap: Jouni Malinen <j@w1.fi>