transport: Use template for ServerToken/ClientToken.
transport: Use template for ServerToken/ClientToken.

This removed some duplicate code.

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