Do not add BSS to blacklist on local disconnection request

Do not add BSS to blacklist on local disconnection request

There is no point in marking a BSS temporarily blacklisted based on a
connection failure or disconnection case if that happens as a result of
a local request to disconnect. The blacklist entry could result on
unexpected BSS getting selected on the next connection attempt. In
addition, the code to try to find another BSS within the ESS could
result in scanning a single channel on the next attempt. Fix these
issues by handling the connection failure events only if we are not in
disconnected state (i.e., would try to reconnect after this
automatically).

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>