[nrfconnect] Added recovering CASE session for the light switch #65
+68
−17
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There isn't CASE recovery mechanism, so after resetting lighting
device, the light switch is not able to communicate with it,
as it holds out of date CASE session.
Added releasing CASE session in case invoke command failure due
to timeout reason. After that new session is established and command
retransmitted. CASE session is recovered only once per failure to
prevent multiple tries in case comunnication is seriously broken.