Call rx_SetNoJumbo earlier

For ubik server processes, rx_SetNoJumbo needs to be called before
ubik initialization for it to effect the communication between
dbservers; otherwise, full database transfers may result in Rx
jumbograms on the wire regardless of the jumbo/nojumbo setting. Move
the call to rx_SetNoJumbo to before ubik initialization to avoid this.

Also move the call to rx_SetNoJumbo to immediately after rx_Init* for
all server processes, for consistency. Move similar calls to
rx_SetMaxMTU for the same reason.

Reviewed-on: http://gerrit.openafs.org/7350
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 0debf2d2274db1ea862bfdc2ef767372f1fa77e3)

Change-Id: Iacb1afa853281e856bbb70f39c6ac9a81f210d0d
Reviewed-on: http://gerrit.openafs.org/9121
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>