SONARPLUGINS-3202 resolving\working around data quality issues in default rules

There are some data issues with the output of /dumpIssuesTypes which
need to be worked around:
inspectcode /dumpIssuesTypes includes duplicate entries for
"StructuralSearch":
http://youtrack.jetbrains.com/issue/RSRP-390380

For this, I commented out all but one of the duplicated entries.

IssueType "InvocationIsSkipped" has undocumented "INFO" severity
http://youtrack.jetbrains.com/issue/RSRP-390375

For this, I mapped ReSharper's "INFO" to SonarQube's "INFO"