add utility to collect bandwidth utilization histogram (pcm-bw-histogram.sh)
add utility to collect bandwidth utilization histogram (pcm-bw-histogram.sh)

sample output:

============ Socket 0 ============
bandwidth(GB/s),count,time(%),chart
0-10    ,250    ,50.30  ,###################################################
10-20   ,63     ,12.68  ,#############
20-30   ,77     ,15.49  ,################
30-40   ,97     ,19.52  ,####################
40-50   ,10     ,2.01   ,###
50-60   ,0      ,0.00   ,
60-70   ,0      ,0.00   ,
70-80   ,0      ,0.00   ,
80-90   ,0      ,0.00   ,
90-100  ,0      ,0.00   ,
100-110 ,0      ,0.00   ,
110-120 ,0      ,0.00   ,
120-130 ,0      ,0.00   ,
130-140 ,0      ,0.00   ,
============ Socket 1 ============
bandwidth(GB/s),count,time(%),chart
0-10    ,232    ,46.68  ,###############################################
10-20   ,67     ,13.48  ,##############
20-30   ,84     ,16.90  ,#################
30-40   ,86     ,17.30  ,##################
40-50   ,28     ,5.63   ,######
50-60   ,0      ,0.00   ,
60-70   ,0      ,0.00   ,
70-80   ,0      ,0.00   ,
80-90   ,0      ,0.00   ,
90-100  ,0      ,0.00   ,
100-110 ,0      ,0.00   ,
110-120 ,0      ,0.00   ,
120-130 ,0      ,0.00   ,
130-140 ,0      ,0.00   ,
============ Socket 2 ============
bandwidth(GB/s),count,time(%),chart
0-10    ,245    ,49.30  ,##################################################
10-20   ,65     ,13.08  ,##############
20-30   ,56     ,11.27  ,############
30-40   ,108    ,21.73  ,######################
40-50   ,23     ,4.63   ,#####
50-60   ,0      ,0.00   ,
60-70   ,0      ,0.00   ,
70-80   ,0      ,0.00   ,
80-90   ,0      ,0.00   ,
90-100  ,0      ,0.00   ,
100-110 ,0      ,0.00   ,
110-120 ,0      ,0.00   ,
120-130 ,0      ,0.00   ,
130-140 ,0      ,0.00   ,
============ Socket 3 ============
bandwidth(GB/s),count,time(%),chart
0-10    ,233    ,46.88  ,###############################################
10-20   ,44     ,8.85   ,#########
20-30   ,22     ,4.43   ,#####
30-40   ,29     ,5.84   ,######
40-50   ,29     ,5.84   ,######
50-60   ,24     ,4.83   ,#####
60-70   ,32     ,6.44   ,#######
70-80   ,47     ,9.46   ,##########
80-90   ,36     ,7.24   ,########
90-100  ,1      ,0.20   ,#
100-110 ,0      ,0.00   ,
110-120 ,0      ,0.00   ,
120-130 ,0      ,0.00   ,
130-140 ,0      ,0.00   ,

Change-Id: I1fd3f357accf2cf485a03618d2ecce0d986078db

opcm/pcm,opcm/pcm,opcm/pcm,opcm/pcm