Fix a invalid memory reference error identified by gfortran

[weiwangncar]

Fix a memory problem in Noah LSM after PR#1641

TYPE: bug fix

KEYWORDS: memory issue, Noah LSM, WRF-Hydro

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
After PR#1641 merge, which consisted modification and additions to NoahMP, problems showed up in the model when Noah LSM is used. Errors include random failures when running with a relatively large domain (581x501x56 in one test) and nests, and when model is trying to write output.

Solution:
Using 'configure -D' with gfortran identified the failure in module_sf_noahdrv.F. Examination of the routine suggests the code related to WRF-Hydro implementation could be an issue when WRF-Hydro is not use. Revision is made to the driver so that variables related to WRF-Hydro are properly defined when WRF-Hydro is not used or arrays are not defined.

LIST OF MODIFIED FILES:
M phys/module_sf_noahdrv.F
M phys/module_surface_driver.F

TESTS CONDUCTED:

1. Previously failed large domain and nest tests are working now.
2. Are the Jenkins tests all passing?

RELEASE NOTE:

[dudhia]

Looks like the correct thing to do, but this code has been there since WRF hydro began including the packaging.
Was the invalid reference directly with these arrays in Noah?

[dudhia]

Any idea of what caused the failed test?

[weiwangncar]

@dudhia This is the fail due to a test for NoahMP which we fixed in PR#1670.

[weiwangncar]

This PR is replaced by PR#1671.