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Perform dhcp discovery in a sandboxed environment if possible.

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Perform dhcp discovery if nic valid and dhclient command exists.

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    skip dhcp_discovery and return an empty dict.

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    @return: A list of dicts representing dhcp options for each lease obtained
        from the dhclient discovery if run, otherwise an empty list is
        returned.
    s1Skip dhcp_discovery: Unable to find fallback nic.s8Skip dhcp_discovery: nic %s not found in get_devicelist.tdhclients7Skip dhclient configuration: No dhclient command found.trmtree_ignore_errorstprefixscloud-init-dhcp-t	needs_exeN(RR
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Parse the given dhcp lease file for the most recent lease.

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        content.
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Run dhclient on the interface without scripts or filesystem artifacts.

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    @param interface: Name of the network inteface on which to dhclient.
    @param cleandir: The directory from which to run dhclient as well as store
        dhcp leases.

    @return: A list of dicts of representing the dhcp leases parsed from the
        dhcp.leases file or empty list.
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qbW|S(s� parse rfc3442 format and return a list containing tuple of strings.

    The tuple is composed of the network_address (including net length) and
    gateway for a parsed static route.  It can parse two formats of rfc3442,
    one from dhcpcd and one from dhclient (isc).

    @param rfc3442: string in rfc3442 format (isc or dhcpd)
    @returns: list of tuple(str, str) for all valid parsed routes until the
              first parsing error.

    E.g.
    sr=parse_static_routes("32,169,254,169,254,130,56,248,255,0,130,56,240,1")
    sr=[
        ("169.254.169.254/32", "130.56.248.255"), ("0.0.0.0/0", "130.56.240.1")
    ]

    sr2 = parse_static_routes("24.191.168.128 192.168.128.1,0 192.168.128.1")
    sr2 = [
        ("191.168.128.0/24", "192.168.128.1"), ("0.0.0.0/0", "192.168.128.1")
    ]

    Python version of isc-dhclient's hooks:
       /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes
    RBs[, .]cs'd
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