Confirm that the METplus differences logic handles MTD output file

Describe the Task

The testing infrastructure for MET does not do a good job checking for differences in MTD output files. It first calls diff, and if there are no differences, everything is fine. If there are differences, you see this type of error:

COMPARING mtd/mtd_BASIC_20100517_010000V_2d.txt
file1: test_output_rev5319/mtd/mtd_BASIC_20100517_010000V_2d.txt
file2: test_output_rev5351/mtd/mtd_BASIC_20100517_010000V_2d.txt
cat: /d3/projects/MET/MET_regression/NB20180319/test_rev5351/hdr/met_NA.hdr: No such file or directory
Error in strsplit(strHdr, " ") : non-character argument

In addition: There were 50 or more warnings (use warnings() to see the first 50)

ERROR: compareStat() failed

This task is to update the testing infrastructure to handle the MTD output.

Time Estimate

Estimate the amount of work required here. Issues should represent approximately 1 to 3 days of work.

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Define Related Issue(s)

Consider the impact to the other METplus components.

[ ] METplus, MET, METdatadb, METviewer, METexpress, METcalcpy, METplotpy

Task Checklist

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[ ] Complete the issue definition above, including the Time Estimate and Funding Source.
[ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>_<Description>
[ ] Complete the development and test your changes.
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dtcenter / MET