Remove hard-code python versions from messages

- there is no need to mention python versions in the text just
  after we have reported the required versions.

scripts/newinstall.sh

@@ -567,7 +567,7 @@ else:
 
 #
 #	Test/warn about Python versions, offer to get miniconda if not supported.
-#	LSST currently mandates Python 3.6 and, optionally, 2.7.  We assume that the
+#	LSST currently mandates specific versions of Python.  We assume that the
 #	python in PATH is the python that will be used to build the stack if
 #	miniconda(2/3) is not installed.
 #
@@ -633,8 +633,8 @@ n8l::python_check() {
 				if [[ $pyverok != true ]]; then
 					cat <<-EOF
 
-					Thanks. After you install Python 2.7 or 3.6 and the required modules,
-					rerun this script to continue the installation.
+					Thanks. After you install the required version of Python and the
+					required modules, rerun this script to continue the installation.
 
 					EOF
 					fail