scripts/oe-build-perf-report: use --hostname in --list

Makes it possible to list test results for certain host only, instead of
always listing all results from all hosts.

(From OE-Core rev: 3c07f1f05440234243c570ebfb42dcda2f455a3d)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/oe-build-perf-report

@@ -85,7 +85,9 @@ def get_test_runs(repo, tag_name, **kwargs):
 
 def list_test_revs(repo, tag_name, verbosity, **kwargs):
     """Get list of all tested revisions"""
-    fields, revs = get_test_runs(repo, tag_name, **kwargs)
+    valid_kwargs = dict([(k, v) for k, v in kwargs.items() if v is not None])
+
+    fields, revs = get_test_runs(repo, tag_name, **valid_kwargs)
     ignore_fields = ['tag_number']
     if verbosity < 2:
         extra_fields = ['COMMITS', 'TEST RUNS']
@@ -509,7 +511,7 @@ def main(argv=None):
     repo = GitRepo(args.repo)
 
     if args.list:
-        list_test_revs(repo, args.tag_name, args.list)
+        list_test_revs(repo, args.tag_name, args.list, hostname=args.hostname)
         return 0
 
     # Determine hostname which to use