DISPATCH-1372 alloc_pool intrusive linked list can be replaced by a linked stack
DISPATCH-1372 alloc_pool intrusive linked list can be replaced by a linked stack

Signed-off-by: Kenneth Giusti <kgiusti@apache.org>

This closes #525

bhardesty/qpid-dispatch,ganeshmurthy/qpid-dispatch,bhardesty/qpid-dispatch,ted-ross/qpid-dispatch,mgoulish/qpid-dispatch,ganeshmurthy/qpid-dispatch,bhardesty/qpid-dispatch,kgiusti/dispatch,ChugR/qpid-dispatch,apache/qpid-dispatch,ganeshmurthy/qpid-dispatch,apache/dispatch,apache/dispatch,kgiusti/dispatch,bhardesty/qpid-dispatch,apache/qpid-dispatch,kgiusti/dispatch,apache/qpid-dispatch,apache/dispatch,kgiusti/dispatch,apache/qpid-dispatch,ErnieAllen/qpid-dispatch,ChugR/qpid-dispatch,ChugR/qpid-dispatch,ganeshmurthy/qpid-dispatch,mgoulish/qpid-dispatch,ted-ross/qpid-dispatch,apache/dispatch,mgoulish/qpid-dispatch,ted-ross/qpid-dispatch,ChugR/qpid-dispatch,apache/dispatch,apache/qpid-dispatch,ErnieAllen/qpid-dispatch,ChugR/qpid-dispatch,ted-ross/qpid-dispatch,ted-ross/qpid-dispatch,bhardesty/qpid-dispatch,bhardesty/qpid-dispatch,ErnieAllen/qpid-dispatch,ChugR/qpid-dispatch,apache/dispatch,ted-ross/qpid-dispatch,kgiusti/dispatch,mgoulish/qpid-dispatch,ganeshmurthy/qpid-dispatch,mgoulish/qpid-dispatch,ErnieAllen/qpid-dispatch,ErnieAllen/qpid-dispatch,ganeshmurthy/qpid-dispatch,kgiusti/dispatch,apache/qpid-dispatch,apache/dispatch,bhardesty/qpid-dispatch,mgoulish/qpid-dispatch,ErnieAllen/qpid-dispatch