wrk: improve test.

`-d 1` makes `wrk` only run for 1 second, which is the least amount of time. The default is 10 seconds. And we'll hit `example.com` instead of GitHub since example.com fronted by a CDN and whatnot.
wrk: add 3.1.0 bottle.

Closes #30966.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libusb 1.0.19
libusb: update 1.0.19 bottle.

Closes #30953.
youtube-dl-2014.07.20
youtube-dl: update 2014.07.20 bottle.

Closes #30972.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
add clarifying comments
use ObserverPathnameExtension to remove these files
improve comment
cgdb: update style
cgdb: update 0.6.7 bottle.

Closes #30986.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
activemq: remove used skip_clean
clamav: use more specific skip_clean
emacs: info files are always kept now
Fix install names in files in sbin
arping: update 2.13 bottle.

Fixes #30984.
Simplify onoe