dev-python/etsdevtools: Drop python@ from maintainers

The Enthought suite is a huge pile of NIH.  The ebuilds suffer from
multiple bugs.  The only reverse dependency is sci-visualization/mayavi
that is maintained by sci@, and it only requires a few of the packages.

dev-python/etsdevtools/metadata.xml

@@ -1,10 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="project">
-    <email>python@gentoo.org</email>
-    <name>Python</name>
-  </maintainer>
+  <!-- maintainer-needed -->
   <longdescription lang="en">
     The ETSDevTools project from the Enthought Tool Suite includes a
     set of packages that can be used during the development of a