Suppress Ubuntu ssh -tt error ioctl error.
Update setup module for facts derived from classes

This changes and organizes facts into a base class Facts and several
sub classes that implement the necessary functionality.  The classes
are:
- Facts: base class.  Implements basic facts that should be common to a
  number of platforms.  It is also where SSH keys and SELinux facts are
  set.
- Hardware: A subclass of Facts that should be further
  subclassed per platform for CPU, memory, and related facts.
  - LinuxHardware: subclass of Hardware for Linux platforms
  - SunOSHardware: subclass of Hardware for SunOS platforms
  - FreeBSDHardware: subclass of Hardware for FreeBSD
- Network: A subclass of Facts that that should be further
  subclassed per platform for IP, both IPv4 and IPv6, information.
  - LinuxNetwork: Currently only implementation for determining network
    facts.
- Virtual: A subclass of Facts that that should be further
  subclassed per platform to determine virtual environment facts.
  - LinuxVirtual: Currently only implementation for determining virtual
    facts.

If facts are needed for additional platforms, one of the above classes
(eg Network) can be further subclassed and implement the necessary
functionality.

In addition, it fixes get_network_facts() to work on Fedora17.  That
broke due to changes to ifconfig output.
Adjustments to behavior of Facts and subclass behavior

The Facts class and subclasses no longer take a dict argument for
instantiation.  populate() now returns self.facts.
Other changes:
- Facts.__init__() takes over most of the work from populate() so that
  subclasses can benefit from its knowledge.
- Drop setting unknown facts to 'NA' in __init__() in various
  subclasses.
- Check for presence of facts in get_virtual_facts()
- Update ansible_facts() to use facts.update(<classname>().populate())
Add back erroneously deleted get_file_content()
Check if CPU is QEMU via different mechanism

The processor fact doesn't exist in LinuxVirtual.  Read /proc/cpuinfo
and check if it is QEMU.
Update LinuxNetwork to not use fcntl and ioctls

get_interfaces() updated to read /proc/net/dev.  This means it no
longer provides only interfaces that are up.

get_iface_hwaddr() updated to read from /sys/class/net/<iface>/address.

Added get_interface_facts() to pull in mac address and interface mtu.
Can be used later for additional interface-facts.

Added get_ipv6_facts(), which reads from /proc/net/if_inet6.

get_network_facts() renamed to get_ipv4_facts().  It still calls
ifconfig to determine ipv4 facts.
Merge pull request #631 from sfromm/facts

Update setup module for facts derived from classes - take 2
Merge pull request #630 from cocoy/ssh-ubuntu

Suppress Ubuntu ssh -tt getting ioctl error.
fixed debian changelog format
Merge pull request #636 from preyk-work/devel

fixed debian changelog format
git mkdir causes problems with older git (can't checkout to existing directory)
Merge pull request #637 from goozbach/git-mkdir

git mkdir causes problems with older git (can't c/o to existing directory)
Fix for issue 604

Do not switch to master branch in pull()
Add --track to git checkout, when checking out a remote branch to track.
Merge pull request #638 from sfromm/issue604

Fix for issue 604
improved output in with_items fixes: #627
Sanitize possible password argument when logging invocation; taken from user module
Merge pull request #640 from sfromm/fancy

Sanitize possible password argument when logging invocation
AnsibleModule (in module_common.py) now correctly reads param values containing '='.
Merge pull request #644 from bradobro/common_fix

AnsibleModule now correctly reads param values with '"'.
Merge pull request #639 from goozbach/issue-627

improved output in with_items fixes: #627