dovetail tool: replace the hard-coded "Tescase" and modify some classmethod

JIRA: DOVETAIL-45

1. In the testcase.py file, we replace the hard-coded "Tesecase" with "cls" or "self" based on
   the specific contexts.
2. For all the four committed files, we modify some classmethod into staticmethod because each
   method is basically just a function, called syntactically like a method, but without access
   to the object and its' internals (attributes and other methods).

Change-Id: Ieb452f476a2d33ae9aca4c904ae7d2c92b68689e
Signed-off-by: Linghui Zeng <linghui.zeng@huawei.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/dovetail/container.py b/dovetail/container.py
index 6d7ac94d..57ce2144 100644
--- a/dovetail/container.py
+++ b/dovetail/container.py
@@ -29,8 +29,8 @@ class Container:
     def get(cls, type):
         return cls.container_list[type]
 
-    @classmethod
-    def get_docker_image(cls, type):
+    @staticmethod
+    def get_docker_image(type):
         return '%s:%s' % (dovetail_config[type]['image_name'],
                           dovetail_config[type]['docker_tag'])
 
@@ -62,14 +62,14 @@ class Container:
             dt_utils.exec_cmd(cmd, logger)
             cls.has_pull_latest_image[type] = True
 
-    @classmethod
-    def clean(cls, container_id):
+    @staticmethod
+    def clean(container_id):
         cmd1 = 'sudo docker stop %s' % (container_id)
         dt_utils.exec_cmd(cmd1, logger)
         cmd2 = 'sudo docker rm %s' % (container_id)
         dt_utils.exec_cmd(cmd2, logger)
 
-    @classmethod
-    def exec_cmd(cls, container_id, sub_cmd, exit_on_error=False):
+    @staticmethod
+    def exec_cmd(container_id, sub_cmd, exit_on_error=False):
         cmd = 'sudo docker exec %s /bin/bash -c "%s"' % (container_id, sub_cmd)
         dt_utils.exec_cmd(cmd, logger, exit_on_error)