massive increase to thread cound to account for stalled ssh connections when the m3 filesytems are slow

Revert "Revert "increase number of threads ... if a login node is slow it can cause a thread to block for quite some time""

This reverts commit 93874ab9.

Revert "increase number of threads ... if a login node is slow it can cause a thread to block for quite some time"

This reverts commit 0d959536.

increase number of threads ... if a login node is slow it can cause a thread to block for quite some time