remove network_public_ip fact

this fact seems to be going against the general philosophy and
methodology of the module: it's accessing an external unknown and
potentially untrusted third-party services.

as there is no way to partially disable facts in puppet, it is probably
better, albeit more conservative, to remove this fact.
indent sub-entries to the in interfaces

debian's documentation recommends indenting sub-entries in
network/interfaces, so we'll do that too.
Merge pull request #82 from igalic/indent

indent sub-entries to the in interfaces
Merge pull request #76 from Asquera/bugfix/rh-consistent-network-device-naming

RHEL7/ CentOS7: adapt ifcfg detection to new device naming scheme
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'igalic/no-internet'