strand: fix second race condition from calling function on a strand
strand: fix second race condition from calling function on a strand

* Once you finish procession a strand you must reset
the processing thread id to 0

Change-Id: Idf657f010d5f61bccf7f8494b14558b75f7da2de
Reviewed-on: http://gerrit.aldebaran.lan/69670
Reviewed-by: jlamotte <70353e7b0c7d18b7fc75605daf0ccba69fcd3222@aldebaran.com>
Reviewed-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran.com>
Tested-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi