* Optional yangs for testing have been removed from the Clixon repo

* These were included for testing
  * If you want to run the Clixon test suite you need to point `YANGMODELS`, see test/README.md
  * The following configure options have been removed:
    * `configure --with-opt-yang-installdir=DIR`
    * `configure   --enable-optyangs`
  * You may need to specify standard YANGs using configure option `--with-yang-standard-dir=DIR`
* Updated yang ietf models with fetures for tet
* Added option `CLICON_YANG_AUGMENT_ACCEPT_BROKEN` to accept broken yangmodels.
  * This is a debug option for CI testcases where standard YANG models are broken

test/lib.sh

@@ -138,17 +138,6 @@ fi
 # Start restconf user, can be root which is dropped to wwwuser
 : ${wwwstartuser:=root} 
 
-# Parse yangmodels from https://github.com/YangModels/yang
-# Recommended: checkout yangmodels elsewhere in the tree and set the env
-# to that
-#: ${YANGMODELS=$(pwd)/yang} # just skip if not set
-
-# Parse yang openconfig models from https://github.com/openconfig/public
-#: ${OPENCONFIG=$(pwd)/public} # just skip if not set
-
-# Standard IETF RFC yang files. 
-: ${IETFRFC=../yang/mandatory}
-
 # Some restconf tests can run IPv6, but its complicated because:
 # - docker by default does not run IPv6
 : ${IPv6:=false}
@@ -187,6 +176,11 @@ if [ -f ./site.sh ]; then
     done
 fi
 
+# Standard IETF RFC yang files. 
+if [ ! -z ${YANGMODELS} ]; then
+    : ${IETFRFC=$YANGMODELS/standard/ietf/RFC}
+fi
+
 # Check sanity between --with-restconf setting and if nginx is started by systemd or not
 # This check is optional because some installs, such as vagrant make a non-systemd/direct
 # start