MPI fix to UOST file read - speed up

[erinethomas]

This PR adds a MPI fix to WW3 that speeds up the reading of the unresolved obstacle ascii files. This massively speeds up the WW3 initialization speed. This PR addresses the long standing issue posted here:E3SM-Project/E3SM#6670

WW3 currently reads the ASCII files for unresolved obstacles on every processor. This PR puts in a MPI broadcast to reduce the number of processors trying to read the same file at once.

several tests were run to quantify initialization speed up as follows.
Overall, the initialization speed up is an order of magnitude, with negligible impact to the run time:

Test	Init time (seconds)	Run Time (seconds)
1-day-test_1_No_fix	3945	99
1-day-test_1_with_fix	155	172
1-day-test_2_No_fix	2964	104
1-day-test_2_with_fix	439	121
1-month-test_No_fix	2550	2874
1-month-test_with_fix	355	2914

[sbrus89]

Passes e3sm_wav_developerwith baseline comparison (and with significant speedup). Thanks for the great work @erinethomas!

[sbrus89]

@erinethomas, this is all set for a submodule update PR in E3SM.