rx: Don't let timeouts force fast recovery

rx: Don't let timeouts force fast recovery

The current RX implementation goes into fast recovery whenever a
timeout occurs. This is incredibly wasteful, particularly on fast
connections. So, remove this in favour of TCP style behaviour.

(cherry picked from commit 36e2d13b55085c996d38b30d003296c602ef8ee3)
Reviewed-on: http://gerrit.openafs.org/3138
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Change-Id: I43102ffc961d33255c995f4ff84142b7203cd11b
Reviewed-on: http://gerrit.openafs.org/3154
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>