Install package from custom deb hosted on S3.
    Return true if package was installed by this invocation.

def install_deb(pkgname, url):
    """Install package from custom deb hosted on S3.
    Return true if package was installed by this invocation."""
    status = run("dpkg-query -W -f='${{Status}}' {p}; true".format(p=pkgname))
    if ('installed' not in status) or ('not-installed' in status):
        deb = url.rpartition('/')[2]
        debtmp = '/tmp/{}'.format(deb)
        run("wget --no-check-certificate -qc -O '{}' '{}'".format(debtmp, url))
        sudo("dpkg -i '{0}' && rm -f '{0}'".format(debtmp))
        return True
    else:
        return False