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[core] Fix spelling errors in code comment within PacketParserUtils
[mam] Fix MamPrfsIQProviderTest
Parsers handed over to IQ providers should be positioned at the IQ
child element when being invoked. Therefore we remove the wrapping
<iq> in some test XML.
Also make checkMamPrefsIQProvider() a paramterized test.
[mam] Delete unused local variable 'iqType' in MamPrefsIQProvider