task: add extra_hosts feature (#48)

Author: dariusstefan

docs/tasks.md

@@ -116,6 +116,9 @@ omitting these keys works only if the volume is defined in the scenario
 (see [Scenario](config/scenario.md#volumes) for more details);  if the
 volume is defined outside of the scenario, it should be declared as a dictionary
 with the `bind` and `mode` keys, otherwise an exception is raised.
+* `extra_hosts`: a dictionary of additional hosts that should be added to the
+container's `/etc/hosts` file; the keys are the hostnames, and the values
+are the IP addresses;
 
 You can find the specific settings for each task type in their corresponding
 file in the  [tasks](tasks) directory.

sipssert/task.py

@@ -57,6 +57,7 @@ def __init__(self, test_dir, configuration):
         self.resolve_networks()
         self.healthcheck = self.config.get("healthcheck", {"test": []})
         self.checklogs = self.get_checklogs()
+        self.extra_hosts = self.config.get("extra_hosts", {})
         self.deps = dependencies.parse_dependencies(self.config.get("require"))
         # keep this for backwards compatibility
         self.delay_start = self.config.get("delay_start", 0)
@@ -167,7 +168,8 @@ def create(self, controller, prefix=None):
                            'name': self.container_name,
                            'environment': env,
                            'stop_signal': self.stop_signal,
-                           'network_mode': self.host_network
+                           'network_mode': self.host_network,
+                           'extra_hosts': self.extra_hosts
                           }
 
         self.log.info("container {} prepared".format(self.container_name))