bpflist: use smarter print format
bpflist: use smarter print format

BPF object type can be wider than 8 characters, e.g., for the "raw-tracepoint"
type.  Compute the printing format automatically based on the maximum length of
BPF objects to be listed.

Signed-off-by: Anton Protopopov <73889760778ff960467ba75991d0ae67a00c37ec@gmail.com>

iovisor/bcc,tuxology/bcc,tuxology/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc