introduce a config option to not auto-up services

This is a PoC implementation of solution 2) from docker#1896:
It adds the config option "auto_up" as boolean to mark a service to not
start by default when calling "docker-compose up" but instead only when
given explicitly or pulled in as a dependency of another service.

TODO: update docs, tests and comments for changed functions

compose/config/config_schema_v1.json

@@ -18,6 +18,7 @@
       "type": "object",
 
       "properties": {
+        "auto_up": {"type": "boolean"},
         "build": {"type": "string"},
         "cap_add": {"type": "array", "items": {"type": "string"}, "uniqueItems": true},
         "cap_drop": {"type": "array", "items": {"type": "string"}, "uniqueItems": true},

compose/config/config_schema_v2.0.json

@@ -50,6 +50,7 @@
       "type": "object",
 
       "properties": {
+        "auto_up": {"type": "boolean"},
         "build": {
           "oneOf": [
             {"type": "string"},

compose/project.py

@@ -124,7 +124,7 @@ def validate_service_names(self, service_names):
             if name not in valid_names:
                 raise NoSuchService(name)
 
-    def get_services(self, service_names=None, include_deps=False):
+    def get_services(self, service_names=None, include_deps=False, auto_up_only=False):
         """
         Returns a list of this project's services filtered
         by the provided list of names, or all services if service_names is None
@@ -140,9 +140,11 @@ def get_services(self, service_names=None, include_deps=False):
         """
         if service_names is None or len(service_names) == 0:
             service_names = self.service_names
+        else:
+            auto_up_only = False
 
         unsorted = [self.get_service(name) for name in service_names]
-        services = [s for s in self.services if s in unsorted]
+        services = [s for s in self.services if s in unsorted and (not auto_up_only or s.options.get('auto_up', True))]
 
         if include_deps:
             services = reduce(self._inject_deps, services, [])
@@ -152,8 +154,8 @@ def get_services(self, service_names=None, include_deps=False):
 
         return uniques
 
-    def get_services_without_duplicate(self, service_names=None, include_deps=False):
-        services = self.get_services(service_names, include_deps)
+    def get_services_without_duplicate(self, service_names=None, include_deps=False, auto_up_only=False):
+        services = self.get_services(service_names, include_deps, auto_up_only)
         for service in services:
             service.remove_duplicate_containers()
         return services
@@ -250,7 +252,7 @@ def build(self, service_names=None, no_cache=False, pull=False, force_rm=False):
                 log.info('%s uses an image, skipping' % service.name)
 
     def create(self, service_names=None, strategy=ConvergenceStrategy.changed, do_build=True):
-        services = self.get_services_without_duplicate(service_names, include_deps=True)
+        services = self.get_services_without_duplicate(service_names, include_deps=True, auto_up_only=True)
 
         plans = self._get_convergence_plans(services, strategy)
 
@@ -305,7 +307,8 @@ def up(self,
         self.initialize()
         services = self.get_services_without_duplicate(
             service_names,
-            include_deps=start_deps)
+            include_deps=start_deps,
+            auto_up_only=True)
 
         plans = self._get_convergence_plans(services, strategy)
         return [