Fixed pillar_roots generation for salt-master.

[jpic]

With a simple pillar like this::

$ sudo salt-call --config-dir /srv/etc/bootstrap --pillar-root /srv/pillar pillar.get salt:pillar_roots
local:
    ----------
    base:
        - /srv/pillar

This was generated in /etc/salt/master.d/f_defaults.conf::

# highstate format, and is generally just key/value pairs.
pillar_roots:base:- /srv/pillar
#

Resulting in parse errors by salt::

$ sudo salt '*' state.highstate
[ERROR   ] Error parsing configuration file: /etc/salt/master.d/f_defaults.conf - while scanning a simple key
  in "<string>", line 531, column 1:
    pillar_roots:base:- /srv/pillar
    ^
could not found expected ':'
  in "<string>", line 532, column 1:
    #
    ^
[ERROR   ] Error parsing configuration file: /etc/salt/master.d/f_defaults.conf - while scanning a simple key
  in "<string>", line 531, column 1:
    pillar_roots:base:- /srv/pillar
    ^
could not found expected ':'
  in "<string>", line 532, column 1:
    #
    ^

This patch will fix it as such::

      ID: salt-master
Function: file.recurse
    Name: /etc/salt/master.d
  Result: True
 Comment: Recursively updated /etc/salt/master.d
 Started: 11:37:12.946823
Duration: 6255.296 ms
 Changes:
          ----------
          /etc/salt/master.d/f_defaults.conf:
              ----------
              diff:
                  ---
                  +++
                  @@ -528,7 +528,9 @@
                   # Pillar is laid out in the same fashion as the file server, with environments,
                   # a top file and sls files. However, pillar data does not need to be in the
                   # highstate format, and is generally just key/value pairs.
                  -pillar_roots:base:- /srv/pillar
                  +pillar_roots:
                  +  base:
                  +    - /srv/pillar
                   #

Resulting in::

# highstate format, and is generally just key/value pairs.
pillar_roots:
  base:
    - /srv/pillar
#

[jpic]

Awesome, thanks !