Store pool name in component registry

Alongside other information about provider pools, store the configured
name of a pool in the PoolComponent of the component registry.

Change-Id: I509a6cfd42c24bc55f563fd13222af129015b727

nodepool/launcher.py

@@ -455,6 +455,7 @@ class PoolWorker(threading.Thread, stats.StatsReporter):
         pool_config = self.getPoolConfig()
         self.component_info.content.update({
             'id': self.launcher_id,
+            'name': self.pool_name,
             'provider_name': self.provider_name,
             'supported_labels': list(pool_config.labels),
             'state': self.component_info.RUNNING,

nodepool/tests/unit/test_zk.py

@@ -36,6 +36,7 @@ class TestComponentRegistry(tests.DBTestCase):
             version=get_version_string())
         launcher.content.update({
             'id': "launcher-Poolworker.provider-main-" + uuid.uuid4().hex,
+            'name': 'main',
             'provider_name': 'provider',
             'supported_labels': [],
             'state': launcher.RUNNING,

nodepool/zk/components.py

@@ -215,6 +215,7 @@ class PoolComponent(BaseComponent):
         super().__init__(*args, **kwargs)
         self.initial_state = {
             "id": None,
+            "name": None,
             "provider_name": None,
             "supported_labels": [],
             "priority": 100,