inaccurate already loaded message when tagging module

[xdelaruelle]

On version 5.1.0, when verbosity is set to verbose2 or to a higher level, if an already loaded module is loaded again but with new tag to set, an inaccurate Module is already loaded message is reported:

$ module load dot
$ module load -vv --tag=foo dot
Loading dot
  INFO: Module 'dot' is already loaded

Tagging dot <foo>

This Module is already loaded message should be removed if some new tags are set.