Malformed redhat files are generated

[rski]

With the current master (1be5bcd) I get interface files that contain lines like MTU=absent. For example:

network_config { 'eth1':
  ensure      => present,
  family      => 'inet',
  #ipaddress   => '127.0.0.2',
  method      => 'static',
  netmask     => '255.255.255.0',
  onboot      => true,
  reconfigure => true,
  options     => {},
}

will generate:

IPADDR=absent
NETMASK=255.255.255.0
BOOTPROTO=static
ONBOOT=yes
DEVICE=eth1
HOTPLUG=yes
MTU=absent

Then, if I try to bring the interface up:

$ sudo ifup eth1
Error: argument "absent" is wrong: Invalid "mtu" value

This does not seem to happen with the debian provider

[igalic]

amazing _

[rski]

Ok, this happens because every possible key is pushed in the options hash, so the ones that are not given a value end up with absent. I'll submit a pr to fix this soonish, but the way that :absent is checked for and treated by the provider needs to be sanity checked. Probably tests need to be written for that too. I don't really have enough ruby experience required to do this, so someone with a bit more knowledge should do it.
tl;dr all ifs and || let :absent pass through

[rski]

fixed #143