Branch b1_6

b=14529
i=adilger
i=panda

Description: MDS or OSS nodes crash due to stack overflow
Details    : Code changes in 1.6.4 increased the stack usage of some functions.
             In some cases, in conjunction with device drivers that use a lot
             of stack the MDS (or possibly OSS) service threads could overflow
             the stack.  One change which was identified to consume additional
             stack has been reworked to avoid the extra stack usage.