Synthetic datasets catalog for CI testing

[aradhakrishnanGFDL]

• We need a sample static data catalog with the synthetic datasets (CMIP, GFDL). This will be used in CI testing.

• The catalogs will also need to contain standard_name and/or long_name.

• we will leverage the use of the GFDL catalog builder to test and generate a catalog for the MDTF framework.

example directory structure:

1. CMIP synthetic daily fields in [/nbhome/a1r/mdtf]/mdtf_test_data/CMIP_Synthetic_r1i1p1f1_gr1_19900101-20091231/day
filename example: CMIP_Synthetic_r1i1p1f1_gr1_19900101-20091231.hfls.day.nc

monthly fields in  

[/nbhome/a1r/mdtf]/mdtf_test_data/CMIP_Synthetic_r1i1p1f1_gr1_19900101-20091231/mon/ 

filename example:  CMIP_Synthetic_r1i1p1f1_gr1_19900101-20091231.hfls.mon.nc

(uses: mdtf_synthetic.py -c CMIP --startyear 1990 --nyears 20) 

2. GFDL synthetic 
 [/nbhome/a1r/mdtf]/mdtf_test_data/GFDL.Synthetic/day/GFDL.Synthetic.precip.day.nc

 (uses: mdtf_synthetic.py** -c GFDL --startyear 1 --nyears 10 )