Travis CI: Install DNS Masq
Travis CI: Install DNS Masq

We need to install dnsmasq to be able to run networking unit test
cases. In the latest travis VM image, dnsmasq is no longer present.

Signed-off-by: Manohar Castelino <f32964ad29a31ea3feb8b48f3bb1748edf23aee2@intel.com>

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