xorriso: fix version
Find vim on the path

If vim is on the path, it will be used instead of `/usr/bin/vim`.

Closes #29885.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
tsung: upgraded to version 1.5.1, added HEAD

1.5.1 includes a bug fix for HTTPS server testing.

Closes #29917.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Install pip and setuptools to prefix.

Installing pip in Cellar cause error on upgrading pip or setuptools.
Fixes #26900.
python: update 2.7.7_1 bottle.