oo-accept-node: Add check_ext_net_dev_addr

Add check_ext_net_dev_addr to oo-accept-node to check that the network
interface specified by EXTERNAL_ETH_DEV in /etc/openshift/node.conf has
a globally scoped IPv4 address (if it does not, oo-iptables-port-proxy
will fail).

This commit fixes bug 1121206.
oo-accept-node: Handle non-existence of /sbin/ip

Modify check_node_public_resolution to rescue from Errno::ENOENT when
running /sbin/ip in case the command does not exist.  This change makes
check_node_public_resolution consistent with the find_ext_net_dev test.

This commit fixes bug 1121224.
Openshift overwrites postgresql.conf during restart, destroying SSL
configuration

https://bugzilla.redhat.com/show_bug.cgi?id=1121727
Merge pull request #5634 from jwhonce/origin_node_401

Merged by openshift-bot
Automatic commit of package [rubygem-openshift-origin-node] release [1.28.2-1].
Automatic commit of package [openshift-origin-cartridge-haproxy] release [1.26.2-1].
Automatic commit of package [openshift-origin-cartridge-postgresql] release [1.27.2-1].
Automatic commit of package [openshift-origin-msg-common] release [1.20.2-1].
Automatic commit of package [openshift-origin-msg-node-mcollective] release [1.25.2-1].
Automatic commit of package [rubygem-openshift-origin-controller] release [1.28.2-1].
Automatic commit of package [rubygem-openshift-origin-common] release [1.27.2-1].
Automatic commit of package [openshift-origin-node-util] release [1.27.2-1].
Final changes to the comp guide for v4
Merge pull request #5615 from nhr/final_comp_guide_changes

Merged by openshift-bot
Bug 1121971: Validate based on domain owner capabilities during app create
Merge pull request #5623 from Miciah/bug-1121206-oo-accept-node-add-check_ext_net_dev_addr

Merged by openshift-bot
Fix syntax error in oo-diagnostics
Merge pull request #5624 from Miciah/bug-1121224-oo-accept-node-handle-non-existence-of-slash-sbin-slash-ip

Merged by openshift-bot
Merge pull request #5635 from bparees/postgres_ssl

Merged by openshift-bot
Merge pull request #5638 from liggitt/bug_1121971_validate_domain_owner

Merged by openshift-bot