[monitoring-plugins/monitoring-plugins] Update .travis.yml (#1440)

[Elan Ruusamäe]

@sni you should understand how shell parser works. wc and grep are not ran
under sudo, they are next command in pipe chain, if *want* them to run under
sudo, you must prepend sudo to each of them

why it works is likely "ip" command does not require root access, and sudo
will just include `/sbin` in path so the program is visible. solution: use
abs path.

however i kept sudo, because depending on kernel hardening `ip` via `sudo`
may give more information than under normal user.

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