[disable ci] Update default install strategy

toolset/run-tests.py

@@ -100,7 +100,7 @@ def main(argv=None):
     parser.add_argument('--install', choices=['client', 'database', 'server', 'all'], default=None,
                         help='Runs installation script(s) before continuing on to execute the tests.')
     parser.add_argument('--install-error-action', choices=['abort', 'continue'], default='continue', help='action to take in case of error during installation')
-    parser.add_argument('--install-strategy', choices=['unified', 'pertest'], default='pertest', 
+    parser.add_argument('--install-strategy', choices=['unified', 'pertest'], default='unified', 
         help='''Affects `--install server`: With unified, all server software is installed into a single directory. 
         With pertest each test gets its own installs directory, but installation takes longer''')