Get rid of dependency on dpath

dpath isn't in the OpenStack global requirements list, so it's one of
the things breaking the requirements job. Furthermore, it's only used on
one line, to avoid some trivial Python code. Just get rid of it.

Change-Id: I4d284894e48a20c60f9c57e0d2c0696dc348fb0b
Depends-On: https://review.openstack.org/604386

heat-config-docker-compose/install.d/50-heat-config-hook-docker-compose

@@ -12,6 +12,6 @@ elif [ -f /etc/redhat-release ]; then
     systemctl enable docker.service
 fi
 
-pip install -U dpath docker-compose==1.4.0
+pip install -U docker-compose==1.4.0
 
-install -D -g root -o root -m 0755 ${SCRIPTDIR}/hook-docker-compose.py /var/lib/heat-config/hooks/docker-compose
+install -D -g root -o root -m 0755 ${SCRIPTDIR}/hook-docker-compose.py /var/lib/heat-config/hooks/docker-compose

heat-config-docker-compose/install.d/hook-docker-compose.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 import ast
-import dpath
 import json
 import logging
 import os
@@ -85,7 +84,8 @@ def main(argv=sys.argv):
     os.chdir(proj)
 
     compose_env_files = []
-    for value in dpath.util.values(config, '*/env_file'):
+    for c in config.values():
+        value = c.get('env_file', None)
         if isinstance(value, list):
             compose_env_files.extend(value)
         elif isinstance(value, six.string_types):

test-requirements.txt

@@ -2,7 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 coverage!=4.4,>=4.0 # Apache-2.0
-dpath>=1.3.2
 fixtures>=3.0.0 # Apache-2.0/BSD
 # Hacking already pins down pep8, pyflakes and flake8
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
@@ -10,7 +9,7 @@ mock>=2.0.0 # BSD
 paunch>=1.0.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 requests-mock>=1.1.0 # Apache-2.0
-salt
+salt>=2017.7.4 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT