STATS: Add more hierarchy to counters.
Put error counters under node_index.
/err/<node-name>/<error-name>
E.g:
/err/ip4-lookup/Hash table collisions
/err/ip6-rewrite/Buffer allocation error
Error names are not globally unique, and this allows
for walking all errors for a particular node.
Put interface counters under the directory /if.
E.g. /if/rx
Put system counters under the directory /sys.
E.g. /sys/vector_rate
Change-Id: I5b794d16698f61bcb2063a8cd77a7c4ae36419b8
Signed-off-by: Ole Troan <ot@cisco.com>