ClusterPerf was incorrectly initalizing its Context.
ClusterPerf was incorrectly initalizing its Context.

(this fix eliminates "Long gap" warnings)

utah-scs/RAMCloud,matrix207/RAMCloud,jblomer/ramcloud,utah-scs/RAMCloud,utah-scs/RAMCloud,alexandermerritt/ramcloud,anirajk/RAMCloud,QingkaiLu/RAMCloud,anirajk/RAMCloud,QingkaiLu/RAMCloud,jblomer/ramcloud,jblomer/ramcloud,jblomer/ramcloud,rstutsman/RAMCloud,rstutsman/RAMCloud,alexandermerritt/ramcloud,jblomer/ramcloud,SMatsushi/RAMCloud,alexandermerritt/ramcloud,QingkaiLu/RAMCloud,SMatsushi/RAMCloud,QingkaiLu/RAMCloud,SMatsushi/RAMCloud,rstutsman/RAMCloud,matrix207/RAMCloud,anirajk/RAMCloud,matrix207/RAMCloud,rstutsman/RAMCloud,utah-scs/RAMCloud,anirajk/RAMCloud,jblomer/ramcloud,anirajk/RAMCloud,utah-scs/RAMCloud,SMatsushi/RAMCloud,matrix207/RAMCloud,alexandermerritt/ramcloud,rstutsman/RAMCloud,SMatsushi/RAMCloud,alexandermerritt/ramcloud,QingkaiLu/RAMCloud,SMatsushi/RAMCloud,alexandermerritt/ramcloud,rstutsman/RAMCloud,matrix207/RAMCloud,QingkaiLu/RAMCloud,anirajk/RAMCloud,matrix207/RAMCloud,utah-scs/RAMCloud