switch bcc to use single instance per bcc process, instance dir is bcc_pid, fixed issue #940
switch bcc to use single instance per bcc process,
instance dir is bcc_pid, fixed issue #940

brendangregg/bcc,mcaleavya/bcc,iovisor/bcc,shodoco/bcc,tuxology/bcc,romain-intel/bcc,iovisor/bcc,shodoco/bcc,tuxology/bcc,shodoco/bcc,iovisor/bcc,mcaleavya/bcc,mcaleavya/bcc,tuxology/bcc,iovisor/bcc,shodoco/bcc,shodoco/bcc,romain-intel/bcc,tuxology/bcc,brendangregg/bcc,romain-intel/bcc,tuxology/bcc,mcaleavya/bcc,brendangregg/bcc,romain-intel/bcc,mcaleavya/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,romain-intel/bcc