LU-6210 snmp: Change positional struct initializers to C99

This patch makes no functional changes.  Struct initializers in the
snmp directory that use C89 or GCC-only syntax are updated to C99
syntax.

The C99 syntax prevents incorrect initialization if values are
accidently placed in the wrong position, allows changes in the struct
definition, and clears any members that are not given an explicit
value.

The following struct initializers have been updated:

snmp/lustre-snmp.c:
	struct variable7 clusterFileSystems_variables[]
	struct oid_table osd_table[]
	struct oid_table osc_table[]
	struct oid_table mds_table[]
	struct oid_table mdc_table[]
	struct oid_table cli_table[]
	struct oid_table lov_table[]
	struct oid_table ldlm_table[]

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Iaedd0165bca2a2af2ce6a0f535602a85c6217da8
Reviewed-on: https://review.whamcloud.com/23463


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>