Fixes RAM-307: RecoveryTest::start fails nondeterministically.
Fixes RAM-307: RecoveryTest::start fails nondeterministically.

Make sure all the segments on the backups have been filtered before
starting the getRecoveryData requests for testing.  Otherwise some
TEST_LOG messages may appear twice if the unit test gets ahead of
the BackupService thread which generates filtered segments (it
issues RetryExceptions in that case).

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