ERR tests failing in cesm2_3_beta17

### Brief summary of bug
Testing
ERR_Ld5.f09_t061.B1850MOM.derecho_intel.allactive-defaultio
ERR.ne30pg3_t232.BLT1850_v0c.derecho_intel.allactive-defaultio

### General bug information

**CESM version you are using:** cesm2_3_beta17

**Machine you are using:** derecho

**Have you modified the code? (If so, please point us to you changes.):** No

### Details of bug

Tests fail in cesm2_3_beta17 due to the buildnml for case2 wanting a rpointer.ocn prior to building the case. This can be fixed with a minor change in the mom_interface buildnml file to avoid this error if running a testcase. However after making this change there is still an error in that the archiver is only saving the restart at the end of the run and the xml flag
DOUT_S_SAVE_INTERIM_RESTART_FILES doesn't seem to have any effect.

### Steps to reproduce the problem. Include externals description file(s) and link to public repository

### Screen output or log file showing the error message and context