Return early from end of recovery rpc on backups.
Return early from end of recovery rpc on backups.

This prevents metrics from measuring its own dump time on
the backups.

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