Fix syntax error

Fix syndic requisites

The syndic service was depending upon itself, which caused the salt run
to fail. This commit fixes that by depending on the salt-master service
rather than the salt-syndic service. I also made it more general by
using IDs to specify the provider rather than the name, which is a bit
less reliable.

formulas.jinja: python 2.6 support

formulas.jinja: python 2.6 support

Remove hardcoded paths with {{ slspath }} variable

The git command line tool is a requirement of pygit2

Improved support for Enterprise Linux family OSs (CentOS, RHEL etc)

* Install pygit from package
* Add Official Salt ZeroMQ 4 COPR repository

Note that Salt itself is assumed to already to be available to the system via yum, via EPEL for example

Remove Duplicates from defaults.yaml and map.jinja

fix empty formulas list in pillar with empty dic.

Fix pillar_roots configuration format in master

This commit fixes how `pillar_roots` are generated and after this fix the
generated configuration does not contain any unnecessary new lines:

```yaml
pillar_roots:
  base:
     /srv/salt/dir1
  dev:
     /srv/salt/dir2
     /srv/salt/dir3
  locale:
     /srv/salt/dir4
```

Before this commit the pillar_roots in `f_defaults.conf` for master would be
generated with a lot of empty lines in between directories, like this:

```yaml
pillar_roots:

  base:

     /srv/salt/dir1

  dev:

     /srv/salt/dir2

     /srv/salt/dir3

  local:

     /srv/salt/dir4

```

The minion configuration is not affected and renders fine.

add pillar_roots for minion and master in pillar.example

Cleanup template for easier user reading

The user will already have it's /etc/salt/minion file, so it doesn't need all this info, and it makes easier to know what has been generated and what not

fixed missing add-apt-repository command when ubuntu is the server one

fixed wrong command name: add-apt-repository became apt-add-repository

ec2/gce profiles/providers are no longer configured if they are not used

Needed because salt-cloud will attempt to load them even if they are
filled with invalid default values, creating error spam.

Added config setting for:

* pillar_source_merging_strategy

Added pillar option to redirect profile and map folders.

Change spaces to dashes in IDs for ssh.sls

Exclude require statement when install_packages is False.

The 'require' statement needs a list as input, but doesn't get
any input when install_packages is set to False.

As mentioned in issue #118, provider files may contain passwords
or API keys and should be restricted. Profiles/maps are probably
OK with the defaults.

This obsoletes the salt:cloud:folders and salt:cloud:providers pillar
entries. Provider keys have been moved to /etc/salt/pki/cloud.

These aren't intended to function; they're here to allow the use of
file.recurse on the provider folder, without requiring the user
to provide pillar data for templates they're not using.

Added mine_functions to f_defaults.conf.

Switch config file.recurse to clean by default and tell it to ignore _*

[bugfix] Reverts lookup of salt_cloud_certs to original pillar key, in line with ...

Please refer to issue https://github.com/saltstack-formulas/salt-formula/issues/113.