When stretching the key for vault files, use PBKDF2HMAC() from the
cryptography package instead of pycrypto. This will speed up the opening
of vault files by ~10x.

The problem is here in lib/ansible/utils/vault.py:

    hash_function = SHA256

    # make two keys and one iv
    pbkdf2_prf = lambda p, s: HMAC.new(p, s, hash_function).digest()

    derivedkey = PBKDF2(password, salt, dkLen=(2 * keylength) + ivlength,
                        count=10000, prf=pbkdf2_prf)

`PBKDF2()` calls a Python callback function (`pbkdf2_pr()`) 10000 times.
If one has several vault files, this will cause excessive start times
with `ansible` or `ansible-playbook` (we experience ~15 second startup
times).

Testing the original implementation in 1.9.2 with a vault file:

In [2]: %timeit v.decrypt(encrypted_data)
1 loops, best of 3: 265 ms per loop

Having a recent OpenSSL version and using the vault.py changes in this commit:

In [2]: %timeit v.decrypt(encrypted_data)
10 loops, best of 3: 23.2 ms per loop

Add pciid to LinuxNetwork interface fact

output now defaults back to having indent=4

This commit adds pciid to the LinuxNetwork fact object.

pciid is gathered if the symlink /sys/class/net/*/device exists.

Example [>>>> emphasis <<<<]:

$ readlink /sys/class/net/eth0/device
../../../0000:01:00.0

$ ansible localhost --ask-pass -i /tmp/hosts -m setup -a "filter=ansible_eth0"
SSH password:
localhost | success >> {
    "ansible_facts": {
        "ansible_eth0": {
            "active": false,
            "device": "eth0",
            "macaddress": "0c:d2:92:5d:6e:8e",
            "module": "alx",
            "mtu": 1500,
       >>>> "pciid": "0000:01:00.0", <<<<
            "promisc": true,
            "type": "ether"
        }
    },
    "changed": false
}

fixes #11528

Added OpenVZ Inventory python script

Encrypt the vault file after editing only if the contents changed

changelog: fix typos

add distutils package classifiers

Handle quoting of values in dict parameters

I was particularly interested in the programming language ones,
but the others might be useful to others browsing PyPI.

Now with GPLv3+, and Utilities topic.

Fixes #10194

A better error message for «ansible playbook.yml»

Fix incorrect example of vars_prompt

Fixes #11746

This is a very conservative change: we add the hint only if we're
definitely going to die already.

Fixes #11470

only set ansible_ssh_host if not already set

functions to do difs.

Add several DNS-related facts by parsing /etc/resolv.conf

Regex escape filter

Facts include nameservers, domain, search path, sortlist, and options.