LU-4939 utils: allow configuration through yaml files

LU-4939 utils: allow configuration through yaml files

add -F option to lctl set_param
file must be in yaml format.  Will accept either set_param
or conf_param formats and issue the appropriate commands

Reorganize set_param and conf_param infrastructures to allow
for shared code.

rename jt_lcfg_mgsparam to jt_lcfg_confparam
rename jt_lcfg_mgsparam2 to jt_lcfg_setparam_perm

Add test_806 to test reconfigure after writeconf

Test-Parameters: trivial testlist=conf-sanity
Signed-off-by: Ben Evans <bevans@cray.com>
Change-Id: I8c36ea9be162112e75412fbd990a4f21e108d000
Reviewed-on: https://review.whamcloud.com/31846
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>