[BZ 1080909] DynaGroup expression evaluator is not strict when grouping by resource configuration property

This commit introduces new way to match resource or pluginConfiguration
property. To enable 'strict' match to property name, one can refer to it by
pluginConfiguration["prop"] (property name in double quotes). Strict match
in means resulting SQL would be 'simple.name = :argX' instead of original
'simple.name LIKE :argX'. Original behavior when refering
pluginConfiguration[prop] is not affected.