[predicates] ExpectedValuePredicate now accepts a dict parameter
``match_form_params`` and ``match_kwargs`` benefit from that.
For instance, the following statements are valid::
__select__ = match_form_params('vid', 'subvid')
__select__ = match_form_params(vid='list', subvid='incontext')
__select__ = match_form_params(vid=('list', 'tsearch'))
In the latter cases, not only the parameters (``vid``/``subvid``)
must be in the request form but their corresponding value must also match
the expected values (or one of possible choices if `values` is a sequence).
closes #5484070
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception