set salt config and log dir to live under Homebrew

saltstack.patch

diff --git a/salt/client.py b/salt/client.py
index cd8aacf..38f8857 100644
--- a/salt/client.py
+++ b/salt/client.py
@@ -69,7 +69,7 @@ class LocalClient(object):
     '''
     Connect to the salt master via the local server and via root
     '''
-    def __init__(self, c_path='/etc/salt/master', mopts=None):
+    def __init__(self, c_path='HOMEBREW_PREFIX/etc/salt/master', mopts=None):
         if mopts:
             self.opts - mopts
         else:
diff --git a/salt/config.py b/salt/config.py
index fe3a076..e9e8ea1 100644
--- a/salt/config.py
+++ b/salt/config.py
@@ -177,7 +177,7 @@ def minion_config(path, check_dns=True):
             'master_finger': '',
             'user': 'root',
             'root_dir': '/',
-            'pki_dir': '/etc/salt/pki/minion',
+            'pki_dir': 'HOMEBREW_PREFIX/etc/salt/pki/minion',
             'id': socket.getfqdn(),
             'cachedir': '/var/cache/salt/minion',
             'cache_jobs': False,
@@ -331,7 +331,7 @@ def master_config(path):
             'timeout': 5,
             'keep_jobs': 24,
             'root_dir': '/',
-            'pki_dir': '/etc/salt/pki/master',
+            'pki_dir': 'HOMEBREW_PREFIX/etc/salt/pki/master',
             'cachedir': '/var/cache/salt/master',
             'file_roots': {
                 'base': ['/srv/salt'],
diff --git a/salt/utils/parsers.py b/salt/utils/parsers.py
index 6c7df9f..0739ef1 100644
--- a/salt/utils/parsers.py
+++ b/salt/utils/parsers.py
@@ -174,7 +174,7 @@ class ConfigDirMixIn(DeprecatedConfigMessage):
 
     def _mixin_setup(self):
         self.add_option(
-            '-c', '--config-dir', default='/etc/salt',
+            '-c', '--config-dir', default='HOMEBREW_PREFIX/etc/salt',
             help=('Pass in an alternative configuration directory. Default: '
                   '%default')
         )

I like this patch (and homebrew-saltstack), but there are few mistakes. brew.py shouldn't be patched at all. There is also room for improvement: sock_dir could be patched as well.

P.S.: I've just reviewed all forks of https://github.com/singingwolfboy/homebrew-saltstack. Each of them is broken in some way (virtualenv, default paths, typos). Formula is good, we just need to polish it.