Merge pull request ESCOMP#397 from cacraigucar/use_python3

cam6_3_025: Use python3 for cime_config scripts

cime_config/buildcpp

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 API for cam's configure

cime_config/buildlib

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 create the cam library

cime_config/buildnml

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 CAM namelist creator

doc/ChangeLog

@@ -1,5 +1,51 @@
 ===============================================================
 
+Tag name: cam6_3_025
+Originator(s): cacraig
+Date: July 5, 2021
+One-line Summary: Update cime_config scripts to python3
+Github PR URL: https://github.com/ESCOMP/CAM/pull/397
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+ - Update cime_config/buildlib, buildnml and buildcpp to use python3 https://github.com/ESCOMP/CAM/issues/394
+
+Describe any changes made to build system:
+ - cime_config scripts now use python3
+
+Describe any changes made to the namelist:
+
+List any changes to the defaults for the boundary datasets:
+
+Describe any substantial timing or memory changes:
+
+Code reviewed by: nusbaume, courtneyp
+
+List all files eliminated:
+
+List all files added and what they do:
+
+List all existing files that have been modified, and describe the changes:
+M       cime_config/buildcpp
+M       cime_config/buildlib
+M       cime_config/buildnml
+    - update to use python3
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+cheyenne/intel/aux_cam:all BFB
+
+izumi/nag/aux_cam: all BFB except:
+    FAIL DAE.f45_f45_mg37.FHS94.izumi_nag.cam-dae COMPARE_base_da
+      - pre-existing failure
+
+izumi/pgi/aux_cam: all BFB
+
+===============================================================
+===============================================================
+
 Tag name: cam6_3_024
 Originator(s): fvitt
 Date: 28 Jun 2021