LU-5396 lnet: make some functions static

LU-5396 lnet: make some functions static

Some functions and variables are only used in their C file, so reduce
their scope. This reduces the code size, and fixes sparse warnings
such as:

  warning: symbol 'proc_lnet_routes' was not declared.
      Should it be static?
  warning: symbol 'proc_lnet_routers' was not declared.
      Should it be static?

Some prototypes were removed from C files and added to the proper
header.

Change-Id: I6b0c527d64ea9e3394cc686699d2e75eec5c16a2
Signed-off-by: Frank Zago <fzago@cray.com>
Reviewed-on: http://review.whamcloud.com/12206
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>