* Yang Configure options changed

* `CLICON_YANG_DIR` is changed from a single directory to a path of directories
    * Note CLIXON_DATADIR (=/usr/local/share/clixon) need to be in the list
  * CLICON_YANG_MAIN_FILE Provides a filename with a single module filename.
  * CLICON_YANG_MAIN_DIR Provides a directory where all yang modules should be loaded.
* Change all @datamodel:tree to @datamodel in all CLI specification files
  * If you generate CLI code from the model (CLIXON_CLI_GENMODEL).
  * For backward compatibility, define CLICON_CLI_MODEL_TREENAME_PATCH in clixon_custom.h
* Removed return value ymodp from yang parse functions (eg yang_parse()).
* New config option: CLICON_CLI_MODEL_TREENAME defining name of generated syntax tree if CLIXON_CLI_GENMODEL is set.

test/test_yang.sh

@@ -5,7 +5,7 @@ APPNAME=example
 . ./lib.sh
 
 cfg=$dir/conf_yang.xml
-fyang=$dir/test.yang
+fyang=$dir/$APPNAME.yang
 fsubmod=$dir/example-types.yang
 fyangerr=$dir/err.yang