VOL-4836: VOLTHA release prep.
Makefile
--------
o Update copyright notice.
o include a few library makefiles for displaying help, etc.
o Added target sterile to make clean + remove venv.
o Replace inlined rm -fr, rm -f with make builtin $(RM) && $(RM) -r
tox.ini
-------
o Add more interpreter versions to envlist so python 3.10.x can be used.
Change-Id: Ideb7e30ff703dff18b707226a4821455f5b1f261
diff --git a/makefiles/lint/json.mk b/makefiles/lint/json.mk
index cc9ecfa..0a11c71 100644
--- a/makefiles/lint/json.mk
+++ b/makefiles/lint/json.mk
@@ -15,7 +15,7 @@
# limitations under the License.
# -----------------------------------------------------------------------
-JSON_FILES ?= $(error JSON_FILES= is required)
+JSON_FILES ?= $(error JSON_FILES= is rqeuired)
.PHONY: lint-json