Fix malformed string format in guest_capture logging

[in-manishkr]

PR Description

This PR fixes a malformed format string in the guest_capture method.
In the current implementation, the logging statement is missing the trailing s in the format specifier, which causes a runtime exception when trying to log.

Current Code (Broken)

LOG.info("Begin to capture vm %(userid), image name is %(name)s",
         {'userid': userid, 'name': image_name})

Fixed Code

LOG.info("Begin to capture vm %(userid)s, image name is %(name)s",
         {'userid': userid, 'name': image_name})

The issue was that %(userid) is not a valid string interpolation placeholder, whereas %(userid)s is correct. This fix ensures logging works without raising exceptions.