Get Rid of nobuild, nolink, and alldeps (#2765)

* Removing the nobuild, nolink, and alldeps dependency types in favor of being explicit.
* This will help with maintenance going forward, as adding more dependency types won't affect existing declared dependencies in weird ways.
* default deptype is still `('build', 'link')`

var/spack/repos/builtin/packages/go-bootstrap/package.py

@@ -53,7 +53,7 @@ class GoBootstrap(Package):
 
     provides('golang@:1.4-bootstrap-20161024')
 
-    depends_on('git', type='alldeps')
+    depends_on('git', type=('build', 'link', 'run'))
 
     # NOTE: Older versions of Go attempt to download external files that have
     # since been moved while running the test suite.  This patch modifies the