LU-7470 nrs: extend TBF with NID/JobID/OPCode expression

LU-7470 nrs: extend TBF with NID/JobID/OPCode expression

Extend the NRS TBF policy to support complex rules with
expressions of NID/JobID/OPCode conditions.

Start the generic extended TBF policy:
    lctl set_param ost.OSS.ost_io.nrs_policies="tbf"

Following rule is valid:
    lctl set_param ost.OSS.ost_io.nrs_tbf_rule=
	"start $NAME opcode={ost_write}&jobid={dd.0},
	 nid={192.168.1.[1-128]@tcp 0@lo} rate=100"
In the rule:
"&" represents the conditional conjunction;
"," represents the conditional disjunction;

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I7541f9d09b2a952853eab97f0aa23f53e2c30a12
Reviewed-on: https://review.whamcloud.com/17345
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>