Hide host network name in Linux sandbox

[deciduously]

While testing builds, I noticed my host machine's hostname was picked up inside the sandbox by a configure script:

Your host name appears to be "kirrahe". Right? [y]
What is your domain name? [.nonet]
What is your e-mail address? [[email protected]]
Perl administrator e-mail address [[email protected]]

We successfully set the username to tangram, but kirrahe is my computer's hostname, which should not be visible to builds. I believe this can be addressed by introducing a UTS namespace via the CLONE_NEWUTS flag when cloneing the guest process.