Query engine does not deal with remapped namespaces

while trying to resolve the query related part of OAK-1098 i realized that the NamePathMapper passed to QueryEngine#executeQuery isn't used to convert jcr names/paths that are passed as part of the query statement.

as far as i can see this affects

• path included in the statement
• property name(s)
• values

i tried to convert my user-mgt related tests to simple query test on the JCR level to illustrate the issue.