Jgfouca/branch for acme split 2018 01 30 (#2264)

Shared change list:
* bless_test_results fix using REALUSER
* more robust stderr presentation for run_cmd_no_fail

Test suite: scripts_regression_tests
Test baseline:
Test namelist changes:
Test status: bit for bit

Fixes [CIME Github issue #]

User interface changes?:

Update gh-pages html (Y/N)?:

Code review: @jedwards4b

driver-mct/cime_config/config_component.xml

@@ -160,6 +160,14 @@
     <desc>case user name</desc>
   </entry>
 
+  <entry id="REALUSER">
+    <type>char</type>
+    <default_value>$ENV{USER}</default_value>
+    <group>case_desc</group>
+    <file>env_case.xml</file>
+    <desc>username of user who created case</desc>
+  </entry>
+
   <!-- ===================================================================== -->
   <!-- definitions runtimes -->
   <!-- ===================================================================== -->
@@ -509,7 +517,7 @@
   <entry id="BATCH_SYSTEM">
      <type>char</type>
      <default_value>none</default_value>
-     <valid_values>lc_slurm,moab,pbs,lsf,slurm,cobalt,cobalt_theta,none</valid_values>
+     <valid_values>nersc_slurm,lc_slurm,moab,pbs,lsf,slurm,cobalt,cobalt_theta,none</valid_values>
      <group>config_batch</group>
      <file>env_batch.xml</file>
      <desc>The batch system type to use for this machine.</desc>