Systemtest_Update test_irr_cube_2 no data to float properly

[Bang Pham Huu]

For coverage 'test_irr_cube_2', the data type is float32 but the null value type is float64, so it needs to update nodata value for these files of this coverage to smaller value for float32.

Band 1 Block=63x16 Type=Float32, ColorInterp=Gray
  Min=3.373 Max=19.264 
  Minimum=3.373, Maximum=19.264, Mean=10.350, StdDev=3.595
  NoData Value=-3.39999999999999996e+38

should be changed to

Band 1 Block=63x16 Type=Float32, ColorInterp=Gray
  Min=3.373 Max=19.264 
  Minimum=3.373, Maximum=19.264, Mean=10.350, StdDev=3.595
  NoData Value=-9.22337204e+18

Also, test_wcps/queries/264-clip_linestring_simple.test

for $c in (test_rgb) return encode( clip($c, LineString(0 0, 390 0)), "csv")

should select some real data from test_rgb instead of returning all null values.

[Bang Pham Huu]

will be fixed in #1983