Update group module to use new shared module code

Upgrading mysql_db to new shared module code

Script to migrate YAML users to the INI format, so we can deprecate YAML inventory (which we are now doing).

./group_vars/groupname.yml (for all groups the host is in)
./host_vars/hostname.yml (for the hostname given in the inventory)

This requires an actual inventory file, not script and the paths are relative
to the directory of the inventory file.

Skip get_ipv6_facts if socket.has_ipv6 is false

improved output in with_items fixes: #627

AnsibleModule now correctly reads param values with '"'.

Sanitize possible password argument when logging invocation

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.

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

fixed debian changelog format

Suppress Ubuntu ssh -tt getting ioctl error.

Update setup module for facts derived from classes - take 2

By defining a main function here, and including it ahead of the boilerplate insertion symbol, tracebacks are
now accurate with respect to the main function, but may include lines not in the original file.  A lot better
than before, where they were offset.

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.

The processor fact doesn't exist in LinuxVirtual.  Read /proc/cpuinfo
and check if it is QEMU.