Fix backup storage benchmark
Fix backup storage benchmark

The intent was to record all reads/write samples. Before, it was
recording the total time to read/write, finding the average bandwidth,
and reporting that as a min.

behnamm/cs244b_project,SMatsushi/RAMCloud,IMCG/RamCloud,IMCG/RamCloud,matrix207/RAMCloud,taschik/ramcloud,utah-scs/RAMCloud,jcarreira/ramcloud,Frank-Wu/RamCloud,IMCG/RamCloud,jcarreira/ramcloud,DavidLi2010/ramcloud,mrdiegoa/ramcloud,SMatsushi/RAMCloud,mrdiegoa/ramcloud,anirajk/RAMCloud,taschik/ramcloud-load-manager,matrix207/RAMCloud,matrix207/RAMCloud,rstutsman/RAMCloud,taschik/ramcloud,utah-scs/RAMCloud,SMatsushi/RAMCloud,taschik/ramcloud-load-manager,y-higuchi/ramcloud,IMCG/RamCloud,jblomer/ramcloud,taschik/ramcloud-load-manager,alexandermerritt/ramcloud,matrix207/RAMCloud,jblomer/ramcloud,Frank-Wu/RamCloud,behnamm/cs244b_project,y-higuchi/ramcloud,jblomer/ramcloud,y-higuchi/ramcloud,IMCG/RamCloud,mrdiegoa/ramcloud,mrdiegoa/ramcloud,behnamm/cs244b_project,alexandermerritt/ramcloud,taschik/ramcloud,DavidLi2010/ramcloud,jblomer/ramcloud,utah-scs/RAMCloud,alexandermerritt/ramcloud,DavidLi2010/ramcloud,rstutsman/RAMCloud,Frank-Wu/RamCloud,IMCG/RamCloud,rstutsman/RAMCloud,taschik/ramcloud,anirajk/RAMCloud,behnamm/cs244b_project,DavidLi2010/ramcloud,DavidLi2010/ramcloud,anirajk/RAMCloud,utah-scs/RAMCloud,mrdiegoa/ramcloud,QingkaiLu/RAMCloud,rstutsman/RAMCloud,Frank-Wu/RamCloud,taschik/ramcloud-load-manager,alexandermerritt/ramcloud,taschik/ramcloud-load-manager,jcarreira/ramcloud,behnamm/cs244b_project,anirajk/RAMCloud,rstutsman/RAMCloud,QingkaiLu/RAMCloud,matrix207/RAMCloud,SMatsushi/RAMCloud,taschik/ramcloud,jblomer/ramcloud,alexandermerritt/ramcloud,y-higuchi/ramcloud,y-higuchi/ramcloud,QingkaiLu/RAMCloud,SMatsushi/RAMCloud,QingkaiLu/RAMCloud,matrix207/RAMCloud,utah-scs/RAMCloud,y-higuchi/ramcloud,Frank-Wu/RamCloud,behnamm/cs244b_project,Frank-Wu/RamCloud,jcarreira/ramcloud,jblomer/ramcloud,mrdiegoa/ramcloud,jcarreira/ramcloud,SMatsushi/RAMCloud,rstutsman/RAMCloud,alexandermerritt/ramcloud,jcarreira/ramcloud,utah-scs/RAMCloud,anirajk/RAMCloud,DavidLi2010/ramcloud,QingkaiLu/RAMCloud,anirajk/RAMCloud,QingkaiLu/RAMCloud