Misc. doc/script/test cleanup.

- fixing some Metrics::add_data() call signatures
- slight refactors to cluster framework @if and adding a NONE NodeType for
  so local_node_type() will return that instead of just emitting an error
  when cluster mode isn't enabled
- `make restdoc` target now uses bro's bare-mode
- bro scripts generated from bifs now really only live in the build/src/base/
  directory and changed the DocSourcesList.cmake to dynamically figure out
  what bifs exist by looking in src/ instead of build/src/
- add some missing @load dependencies

doc/scripts/genDocSourcesList.sh

@@ -68,12 +68,12 @@ sourcedir=${thisdir}/../..
 
 echo "$statictext" > $outfile
 
-bifs=`( cd ${sourcedir}/build/src && find . -name \*\.bro | sort )`
+bifs=`( cd ${sourcedir}/src && find . -name \*\.bif | sort )`
 
 for file in $bifs
 do
-    f=${file:2}
-    echo "rest_target(\${CMAKE_BINARY_DIR}/src $f)" >> $outfile
+    f=${file:2}.bro
+    echo "rest_target(\${CMAKE_BINARY_DIR}/src/base $f)" >> $outfile
 done
 
 scriptfiles=`( cd ${sourcedir}/scripts && find . -name \*\.bro | sort )`