Allow handoff sender to abort handoff by throw'ing from fold fun #626
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(Supersedes #553, cherry picked from @slfritchie's bugfix/handoff-fold-abort-early-2.0)
There's no reason why the handoff sender fold fun has to continue
folding when there's a TCP error. Instead, throw the #ho_acc{}
record with its error={error,Reason} field intact.
If we force the handoff receiver to exit (using exit(HO_pid, kill)),
then we simply see the following logged on the sender side:
Also, change the lager:info() message when the handoff receiver
gets a tcp_error message that includes the reason and
distiguishes itself from other handoff receiver log messages.
Also, one whitespace correction.