Use PROVIDER_LOCAL when DEVELOP env is set (#97)

* Use PROVIDER_LOCAL when DEVELOP env is set

It doesn't make much sense determining provider in this case.
Also it will make it possible to run spilo as standalone app on AWS with
for example jenkins.

* Fix postgis version to 2.3, otherwise build fails

postgres-appliance/Dockerfile

@@ -32,7 +32,7 @@ RUN export DEBIAN_FRONTEND=noninteractive \
             # Install PostgreSQL binaries, contrib, pgq, plproxy, pgq and multiple pl's
             apt-get install -y postgresql-${version} postgresql-${version}-dbg postgresql-client-${version} \
                         postgresql-contrib-${version} postgresql-${version}-plproxy postgresql-${version}-pgq3 \
-                        postgresql-${version}-postgis postgresql-plpython3-${version} \
+                        postgresql-${version}-postgis-2.3 postgresql-plpython3-${version} \
                         postgresql-plpython-${version} postgresql-${version}-plr postgresql-pltcl-${version} \
                         postgresql-${version}-plv8 postgresql-${version}-pllua postgresql-plperl-${version} \
             # Remove the default cluster, which Debian stupidly starts right after installation of the packages

postgres-appliance/configure_spilo.py

@@ -352,7 +352,7 @@ def write_wale_command_environment(placeholders, overwrite, provider):
         if match:
             region = match.group(1)
         else:
-            region = get_instance_meta_data('placement/availability-zone')[:-1]
+            region = get_instance_metadata('placement/availability-zone')[:-1]
         write_file('https+path://s3-{}.amazonaws.com:443'.format(region),
                    os.path.join(placeholders['WALE_ENV_DIR'], 'WALE_S3_ENDPOINT'), overwrite)
     elif provider == PROVIDER_GOOGLE:
@@ -450,11 +450,13 @@ def main():
     if os.environ.get('PATRONIVERSION') < '1.0':
         raise Exception('Patroni version >= 1.0 is required')
 
-    provider = get_provider()
-    placeholders = get_placeholders(provider)
-
-    if os.environ.get('DEVELOP', '') in ['1', 'true', 'on', 'ON']:
+    if os.environ.get('DEVELOP', '').lower() in ['1', 'true', 'on']:
         write_etcd_configuration(placeholders)
+        provider = PROVIDER_LOCAL
+    else:
+        provider = get_provider()
+
+    placeholders = get_placeholders(provider)
 
     config = yaml.load(pystache_render(TEMPLATE, placeholders))
     config.update(get_dcs_config(config, placeholders))