Add installing python with USE="xml" and iproute for install

from Gentoo stage3.

pym/cl_assemble.py

@@ -605,7 +605,8 @@ class cl_assemble(color_print):
         self.printMessageForTest(_("Installing %s")%"layman")
         self.runChroot(emergeLayman)
 
-        emergePython = "USE='xml' emerge python:2.7"
+        # stage3 contains python-2.7 without USE="xml" need for layman
+        emergePython = "USE='xml' emerge -1 python:2.7"
         self.printMessageForTest(_("Installing %s")%"python")
         self.runChroot(emergePython)
 
@@ -725,6 +726,10 @@ class cl_assemble(color_print):
             self.printMessageForTest(
                 _("Enabling calculate-install to configure packages"))
             if "calculate" in self.clVars.Get('os_assemble_system_profile'):
+                # emerge sys-apps/iproute2, because calculate-install
+                # need emerge with USE="minimal", but emerging 
+                # will install iproute2 with USE="minimal" also
+                self.runChroot("emerge -1 sys-apps/iproute2")
                 self.runChroot("USE='minimal -pxe' emerge "
                                'sys-apps/calculate-install')
                 self.runChroot("cl-install --install")