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
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
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