Performance Data added

Output:
OK: aggr0_ntapcl2n1 (95%), aggr1_ntapcl2n1 (49%)|aggr0_ntapcl2n1=95% aggr1_ntapcl2n1=49%
--perf flag for performance data outpu added.

example Output::
OK: tier2 (Size: 64%, Inodes: 0.007%)|size=64%;80;90 inode=0.007%;1;2
--perf flag for performance data output added.
--perf flag for performance data output added.
Merge pull request #1 from SirSteff/patch-1

Performance Data added