tests shouldn't be making symlinks to system dirs, also fixes unit test report on OS X.

 - test part of ansible.runner.filter_plugins.core
 - test ansible.utils.unfrackpath

This should fix simple conditionals like:

    when: ansible_selinux

While here add tests for ansible.utils.check_conditional() in
"jinja2_compare mode".

ansible.constants was calling expanduser (by way of shell_expand_path)
on the entire configured value for the library and *_plugins
configuration values, but these values have always been interpreted as
multiple directories separated by os.pathsep.  Thus, if you supplied
multiple directories for one of these values, typically only the first
(at least on *nix) would have e.g. "~" expanded to HOME.

Now PluginLoader does expansion on each individual path in each of
these variables.

Some continued work on new-style templates and associated test code changes.  Legacy template functions
are marked with "legacy_" for possible future removal.

Add code to flag legacy templating like $foo.{bar} as deprecated in favor of Jinja2 {{ foo.bar }} so we
can remove the legacy system at a later date.

Instead of having to remember when to use which one, rename template_ds
to template and move the last bit of code from template to varReplace
(which gets used for all string replacements, in the end).

This means that you can template any data type without worrying about
whether it's a string or not, and the right thing will happen.

Fixes the case where variable x is '$y' and y is a dict(foo='bar') and
an attempt to access ${x.foo} is made.

Also moves file and pipe to lookup_plugins.

Only expand lists in templating inside of module action lines, to avoid breaking usage with with_items and "in" statements, etc

Automatic quoting of variables in only_if breaks existing playbooks
where entire statements are put in a variable, and other cases. See
issue #1120 for details.

This fixes a few issues,
- ${foo}${bar} would be parsed as a variable named foo}${bar,
  which wouldn't be easily fixed without breaking ${foo.${bar}}
- allows escaping . in variable parts so e.g.
  ${hostvars.{test.example.com}.foo} works

This is slower than using re. 3 million templating calls take about
about twice as long to complete with this compared to the regexp,
from ~65 seconds to ~115 seconds on my laptop.

This fixes e.g. only_if: ${task.changed} which would always
evaluate to true due to it having been replaced by a string for its
boolean value. Also adds a test case to ensure it doesn't get
missed again.

$FILE{file} will be replaced with the contents of "file"
$PIPE{cat file} will be replaced with the output of "cat file"

This reverts commit bf47bb47.

Conflicts:

	lib/ansible/utils.py
	test/TestUtils.py

$FILE{file} will be replaced with the contents of "file"
$PIPE{cat file} will be replaced with the output of "cat file"