fixup! Introduce an InstallMonitor

installed_part_options contains options for all parts, so it can be very
long and cause OSError 7 . Just include options for the part being
uninstalled.

src/zc/buildout/install_monitor.py

@@ -160,12 +160,13 @@ class GitInstallMonitor(object):
 
     def end_uninstall_part(self, name, installed_part_options):
         took = time.time() - self._start_install_time[name]
+        this_installed_part_options = installed_part_options.get(name)
         self._record_changes(
             textwrap.dedent("""\
             Uninstalled part {name} in {took:.2f} seconds
 
             Installed part options:
-              {installed_part_options}
+              {this_installed_part_options}
             """).format(**locals()))