Revert "Add NetCDF libraries on Travis CI to enable NetCDF-4 tests"
Revert "Add NetCDF libraries on Travis CI to enable NetCDF-4 tests"

This reverts commit 365bf62899ee996c7e5d80bfaccf5fa8c47afda5.

geotools/geotools,geotools/geotools,geotools/geotools,geotools/geotools