perf build-id: Print debuginfod queries if -v option is used

When ending a 'perf record' session, the querying of a debuginfod server
can take quite some time. Inform a user about it when -v options is
used.

Signed-off-by: Martin Liška <mliska@suse.cz>
Link: http://lore.kernel.org/lkml/325871cf-b71f-6237-8793-82182272ece8@suse.cz


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>