Remove 'build_sphinx_latex'

codesearch.o.o shows a single, long-dead project using this [1]. Let's
just remove it and push people to set 'builders' instead in they really
want LaTeX.

[1] http://codesearch.openstack.org/?q=build_sphinx_latex

Change-Id: I820d9c540ae81717d7b33bbb4d2a4031b529b52c

pbr/builddoc.py

@@ -227,8 +227,3 @@ class LocalBuildDoc(setup_command.BuildDoc):
         # handle Sphinx < 1.5.0
         if not hasattr(self, 'warning_is_error'):
             self.warning_is_error = False
-
-
-class LocalBuildLatex(LocalBuildDoc):
-    builders = ['latex']
-    command_name = 'build_sphinx_latex'

pbr/hooks/commands.py

@@ -49,7 +49,6 @@ class CommandsConfig(base.BaseConfig):
 
         if packaging.have_sphinx():
             self.add_command('pbr.builddoc.LocalBuildDoc')
-            self.add_command('pbr.builddoc.LocalBuildLatex')
 
         if os.path.exists('.testr.conf') and packaging.have_testr():
             # There is a .testr.conf file. We want to use it.

pbr/packaging.py

@@ -536,11 +536,9 @@ try:
     # Import the symbols from their new home so the package API stays
     # compatible.
     LocalBuildDoc = builddoc.LocalBuildDoc
-    LocalBuildLatex = builddoc.LocalBuildLatex
 except ImportError:
     _have_sphinx = False
     LocalBuildDoc = None
-    LocalBuildLatex = None
 
 
 def have_sphinx():