adding output file location option (#200)

* adding output file location option

* wrong variable

README.md

@@ -39,6 +39,8 @@ When the cerberus is configured to run in the daemon mode, it will continuosly m
 #### Report
 The report is generated in the run directory and it contains the information about each check/monitored component status per iteration with timestamps. It also displays information about the components in case of failure. Refer [report](docs/example_report.md) for example.
 
+You can use the "-o <file_path_name>" option to change the location of the created report
+
 #### Metrics API
 Cerberus exposes the metrics including the failures observed during the run through an API. Tools consuming Cerberus can query the API to get a blob of json with the observed failures to scrape and act accordingly. For example, we can query for etcd failures within a start and end time and take actions to determine pass/fail for test cases or report whether the cluster is healthy or unhealthy for that duration.
 

start_cerberus.py

@@ -557,11 +557,18 @@ def main(cfg):
         help="config location",
         default="config/config.yaml",
     )
+    parser.add_option(
+        "-o",
+        "--output",
+        dest="output",
+        help="output report location",
+        default="cerberus.report",
+    )
     (options, args) = parser.parse_args()
     logging.basicConfig(
         level=logging.INFO,
         format="%(asctime)s [%(levelname)s] %(message)s",
-        handlers=[logging.FileHandler("cerberus.report", mode="w"), logging.StreamHandler()],
+        handlers=[logging.FileHandler(options.output, mode="w"), logging.StreamHandler()],
     )
     if options.cfg is None:
         logging.error("Please check if you have passed the config")