Updated master.d/f_defaults for 2014.7

Added config setting for:

* pillar_source_merging_strategy

salt/files/master.d/f_defaults.conf

@@ -1,5 +1,5 @@
 # This file managed by Salt, do not edit by hand!!
-#  Based on salt version 0.17.4 default config
+#  Based on salt version 2014.7 default config
 {% set reserved_keys = ['master', 'minion', 'cloud', 'salt_cloud_certs'] -%}
 {% set cfg_salt = pillar.get('salt', {}) -%}
 {% set cfg_master = cfg_salt.get('master', {}) -%}
@@ -697,6 +697,14 @@ ext_pillar:
 # master config file that can then be used on minions.
 {{ get_config('pillar_opts', 'True') }}
 
+# The pillar_source_merging_strategy option allows you to configure merging strategy
+# between different sources. It accepts four values: recurse, aggregate, overwrite,
+# or smart. Recurse will merge recursively mapping of data. Aggregate instructs
+# aggregation of elements between sources that use the #!yamlex renderer. Overwrite
+# will verwrite elements according the order in which they are processed. This is
+# behavior of the 2014.1 branch and earlier. Smart guesses the best strategy based
+# on the "renderer" setting and is the default value.
+{{ get_config('pillar_source_merging_strategy', 'smart') }}
 
 #####          Syndic settings       #####
 ##########################################