Fix build_scanner and stats_scanner since Python upgrade

Add exception handling to set_start_method in stats.py and jenkins.py.

Change-Id: Ibeabf6918013d9486a8bfb23353cfb5630f088f5
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/169718
Tested-by: Build Bot <[email protected]>
Reviewed-by: Daniel Nagy <[email protected]>

Author: d-nagy

perfrunner/utils/jenkins.py

@@ -11,7 +11,10 @@
 from logger import logger
 from perfrunner.utils.weekly import Weekly
 
-set_start_method("fork")
+try:
+    set_start_method("fork")
+except Exception as ex:
+    print(ex)
 
 JobMapping = Dict[str, List[Dict[str, str]]]
 

perfrunner/utils/stats.py

@@ -12,7 +12,10 @@
 from perfrunner.utils.jenkins import JenkinsScanner
 from perfrunner.utils.weekly import Weekly
 
-set_start_method("fork")
+try:
+    set_start_method("fork")
+except Exception as ex:
+    print(ex)
 
 StatsSettings = namedtuple('StatsSettings', ('cluster', 'cbmonitor_host'))