Add module loading support to lconf. By default, lconf will load and

Add module loading support to lconf. By default, lconf will load and
unload the modules needed based on what devices are configured for a node.

The path to load modules from is determined based on the directory lconf is
run from. If a Makefile is found, the it is assumed lconf is in lustre/utils
and modules will be searched for in ../../lustre and ../../portals.

Module support can be turned off with --nomod, if desired.

Use option --gdb  to create a gdb module script. Lconf will print the path
of the script and pause for few seconds.