connection: add a debug option to debug boto calls

Basically setting debug level via conf file and setting a stream logger
prefixed with 'boto' for more debugging

Signed-off-by: Abhishek Lekshmanan <abhishek@suse.com>

s3tests/common.py

@@ -108,6 +108,9 @@ def connect(conf):
             raise RuntimeError(
                 'calling_format unknown: %r' % raw_calling_format
                 )
+    if conf.has_key('debug'):
+        kwargs['debug']=conf['debug']
+        boto.set_stream_logger('boto')
     # TODO test vhost calling format
     conn = boto.s3.connection.S3Connection(**kwargs)
     return conn