Add dzstretch_u and dzbot to namelist.input in test/em_real/

[weiwangncar]

TYPE: enhancement, no impact, text only

KEYWORDS: vertical coordinate, namelist

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
The current namelist.input file only has dzstretch_s. To properly use the auto_levels_opt, dzstretch_u and dzbot should be considered.

Solution:
Add dzstretch_u and dzbot in the namelist. Parameters based on UG.

LIST OF MODIFIED FILES:
M test/em_real/namelist.input

TESTS CONDUCTED:
2. Are the Jenkins tests all passing?

RELEASE NOTE: Add dzstretch_u and dzbot in namelist.input. Users are advised to check UG for other parameters to use.

[dudhia]

we might have a release branch already

[weiwangncar]

The regression test results:

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 23           24
Number of Builds       : 60           57
Number of Simulations  : 158           150        0
Number of Comparisons  : 95           86        0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None

[weiwangncar]

@dudhia I can add it to the release branch if approved.

[dudhia]

It is a slightly odd choice to have such a small difference between the factors. Was this used in a project?

[weiwangncar]

It is a slightly odd choice to have such a small difference between the factors. Was this used in a project?

I determined those by running real and looking at the variations of the thickness values printed out.