Print parameters used in auto_levels_opt = 2

[weiwangncar]

TYPE: enhancement

KEYWORDS: auto_levels_opt, dzbot, dzstretch

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
Lack of information in the standard output when running real.exe using auto_levels_opt = 2.

Solution:
Adds print for parameters used to define vertical levels.

LIST OF MODIFIED FILES:
M dyn_em/module_initialize_real.F

TESTS CONDUCTED:

1. Now print like the following is added to output from running real.exe:
   p_top = 1000. Pa, dzbot = 30.0 m, dzstretch_s/u = 1.20 1.02
2. The Jenkins tests are all passing.

RELEASE NOTE: This PR adds a print for parameters used when running real.exe using auto_levels_opt = 2 option, which is the default.

[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 @kkeene44 Can you review this PR?