Description of problem:
During initial installation engine-setup fails to complete with FQDN resolution error if IP is assigned to a VLAN tagged interface (eth0.2000 instead of eth0)

Version-Release number of selected component (if applicable):
oVirt Engine Version: 3.2.2-1.1.el6 on Centos 6.4

How reproducible:


Steps to Reproduce:
1. Install Centos 6.4 Basic Server Package Selection /w EPEL repository added
1a. (Optional) Install dnsmasq to make sure FQDN of server is resolvable from name to IP and IP to name (using dig and dig -x)
2. Install oVirt using steps in http://www.ovirt.org/Download (using ovirt-release-el.noarch.rpm instead of fedora rpm)
3. Run engine-setup it will fail at step where FQDN is entered

Actual results:
engine-setup fails to complete with following message: Exception: Error while trying to read parameter HOST_FQDN from user.

Expected results:
Validator script /usr/share/ovirt-engine/scripts/engine_validators.py should be able to properly parse IP information even if interface is defined with vlan tagging.

Workaround:
Dynamically add IP of eth0.2000 to eth0 with a 32 bit netmask will enable successful parsing and setup completes

Additional info:

2013-06-05 12:39:28::INFO::engine_validators::217::root:: validating wvm111.netas.lab.ovirt.org as a valid domain string
2013-06-05 12:39:28::DEBUG::common_utils::434::root:: Executing command --> '/sbin/ip addr'
2013-06-05 12:39:28::DEBUG::common_utils::472::root:: output = 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:22:fb:d3 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:fe22:fbd3/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:d3:96:59 brd ff:ff:ff:ff:ff:ff
6: eth0.2000@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 52:54:00:22:fb:d3 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.111/24 brd 10.10.10.255 scope global eth0.2000
    inet6 fe80::5054:ff:fe22:fbd3/64 scope link
       valid_lft forever preferred_lft forever

2013-06-05 12:39:28::DEBUG::common_utils::473::root:: stderr =
2013-06-05 12:39:28::DEBUG::common_utils::474::root:: retcode = 0
2013-06-05 12:39:28::ERROR::engine_validators::321::root:: Could not find any configured IP address on the host
2013-06-05 12:39:28::ERROR::engine_validators::384::root:: Traceback (most recent call last):
  File "/usr/share/ovirt-engine/scripts/engine_validators.py", line 322, in validateFQDN
    raise Exception(output_messages.ERR_EXP_CANT_FIND_IP)
Exception: Could not find any configured IP address

2013-06-05 12:39:28::ERROR::engine-setup::632::root:: Traceback (most recent call last):
  File "/usr/bin/engine-setup", line 605, in _getInputFromUser
    if param.getKey("VALIDATION_FUNC")(userInput, param.getKey("OPTION_LIST")):
  File "/usr/share/ovirt-engine/scripts/engine_validators.py", line 322, in validateFQDN
    raise Exception(output_messages.ERR_EXP_CANT_FIND_IP)
Exception: Could not find any configured IP address

2013-06-05 12:39:28::ERROR::engine-setup::1649::root:: Traceback (most recent call last):
  File "/usr/bin/engine-setup", line 1618, in _handleInteractiveParams
    input_param(param)
  File "/usr/bin/engine-setup", line 659, in input_param
    _getInputFromUser(param)
  File "/usr/bin/engine-setup", line 633, in _getInputFromUser
    raise Exception(output_messages.ERR_EXP_READ_INPUT_PARAM % (param.getKey("CONF_NAME")))
Exception: Error while trying to read parameter HOST_FQDN from user.