Update bnd to 5.2.0 (openhab#2105)

See: https://github.com/bndtools/bnd/wiki/Changes-in-5.2.0

Signed-off-by: Wouter Born <[email protected]>

pom.xml

@@ -69,7 +69,7 @@
     <maven.compiler.target>${oh.java.version}</maven.compiler.target>
     <maven.compiler.compilerVersion>${oh.java.version}</maven.compiler.compilerVersion>
 
-    <bnd.version>5.1.2</bnd.version>
+    <bnd.version>5.2.0</bnd.version>
     <eea.version>2.2.1</eea.version>
     <karaf.compile.version>4.2.1</karaf.compile.version>
     <karaf.tooling.version>4.2.7</karaf.tooling.version>
@@ -138,6 +138,7 @@ Import-Package: \\
   !*.impl.*, \\
   org.openhab.*,\\
   org.openhab.core.*
+-noimportjava: true
 -sources: false
 -contract: *
 -includeresource: -${.}/NOTICE, -${.}/*.xsd]]></bnd>