sys-apps/pkgcore: toss pypi upstream metadata for the pkgcore suite

Github is the canonical source, especially as long as pypi only
supports their new, hash-based download urls. Pypi downloads exist
mostly to aid people doing pip installs.

dev-python/pychroot/metadata.xml

@@ -7,6 +7,5 @@
   </maintainer>
   <upstream>
     <remote-id type="github">pkgcore/pychroot</remote-id>
-    <remote-id type="pypi">pychroot</remote-id>
   </upstream>
 </pkgmetadata>

dev-python/snakeoil/metadata.xml

@@ -7,6 +7,5 @@
   </maintainer>
   <upstream>
     <remote-id type="github">pkgcore/snakeoil</remote-id>
-    <remote-id type="pypi">snakeoil</remote-id>
   </upstream>
 </pkgmetadata>

dev-util/pkgcheck/metadata.xml

@@ -6,7 +6,6 @@
     <name>Tim Harder</name>
   </maintainer>
   <upstream>
-    <remote-id type="pypi">pkgcheck</remote-id>
     <remote-id type="github">pkgcore/pkgcheck</remote-id>
   </upstream>
 </pkgmetadata>

sys-apps/pkgcore/metadata.xml

@@ -9,7 +9,6 @@
     <flag name="doc">Build and install API docs.</flag>
   </use>
   <upstream>
-    <remote-id type="pypi">pkgcore</remote-id>
     <remote-id type="github">pkgcore/pkgcore</remote-id>
   </upstream>
 </pkgmetadata>