Setup users host env for local instance support

- Setup flow controller in setup.py
- Define common method in base_task_runner.py
- Required package installer in host_setup_runner.py
- Host env configuration in host_setup_runner.py

Bug: 110388133
Test: ./run_tests.sh, m acloud && acloud setup.
Change-Id: Id8b988149d606553d31dfb466e0ae14883513553
diff --git a/setup/setup_common_test.py b/setup/setup_common_test.py
new file mode 100644
index 0000000..d17d2dc
--- /dev/null
+++ b/setup/setup_common_test.py
@@ -0,0 +1,85 @@
+# Copyright 2018 - The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Tests for host_setup_runner."""
+import subprocess
+import unittest
+
+from acloud import errors
+from acloud.internal.lib import driver_test_lib
+from acloud.setup import setup_common
+
+
+class SetupCommonTest(driver_test_lib.BaseDriverTest):
+    """Test HostPkgTaskRunner."""
+    PKG_INFO_INSTALLED = """fake_pkg:
+  Installed: 0.7
+  Candidate: 0.7
+  Version table:
+"""
+    PKG_INFO_NONE_INSTALL = """fake_pkg:
+  Installed: (none)
+  Candidate: 0.7
+  Version table:
+"""
+    PKG_INFO_OLD_VERSION = """fake_pkg:
+  Installed: 0.2
+  Candidate: 0.7
+  Version table:
+"""
+
+    # pylint: disable=invalid-name
+    def testPackageNotInstalled(self):
+        """"Test PackageInstalled return False when Installed status is (None). """
+        self.Patch(
+            setup_common,
+            "CheckCmdOutput",
+            return_value=self.PKG_INFO_NONE_INSTALL)
+
+        self.assertFalse(
+            setup_common.PackageInstalled("fake_package"))
+
+    def testUnableToLocatePackage(self):
+        """"Test PackageInstalled return False if unable to locate package."""
+        self.Patch(
+            setup_common,
+            "CheckCmdOutput",
+            side_effect=subprocess.CalledProcessError(
+                None, "This error means unable to locate package on repository."))
+
+        with self.assertRaises(errors.UnableToLocatePkgOnRepositoryError):
+            setup_common.PackageInstalled("fake_package")
+
+    # pylint: disable=invalid-name
+    def testPackageInstalledFalseForOldVersion(self):
+        """Test PackageInstalled should return False when pkg is out-of-date."""
+        self.Patch(
+            setup_common,
+            "CheckCmdOutput",
+            return_value=self.PKG_INFO_OLD_VERSION)
+
+        self.assertFalse(setup_common.PackageInstalled("fake_package",
+                                                       compare_version=True))
+
+    def testPackageInstalled(self):
+        """Test PackageInstalled should return True when pkg is installed."""
+        self.Patch(
+            setup_common,
+            "CheckCmdOutput",
+            return_value=self.PKG_INFO_INSTALLED)
+
+        self.assertTrue(setup_common.PackageInstalled("fake_package"))
+
+
+if __name__ == "__main__":
+    unittest.main()