Update environment-modules package (#10717)

The environment modules package has been updated to include 
versions up to 4.0.0. The url of the package and the homepage
have been updated accordingly.

The `spack bootstrap` command now builds version 3.2.10 of
the environment-modules package, and will do until #10708 
is fixed.

lib/spack/spack/cmd/bootstrap.py

@@ -46,7 +46,7 @@ def bootstrap(parser, args, **kwargs):
     # Define requirement dictionary defining general specs which need
     # to be satisfied, and the specs to install when the general spec
     # isn't satisfied.
-    requirement_dict = {'environment-modules': 'environment-modules~X'}
+    requirement_dict = {'environment-modules': 'environment-modules@3.2.10~X'}
 
     for requirement in requirement_dict:
         installed_specs = spack.store.db.query(requirement)