Setup stub /etc

Else screen complains:

(neo) (z-dev) (g.env) I have no name!@deco:/# screen
getpwuid() can't identify your account!

slapns.py

@@ -140,8 +140,10 @@ def main():
     slappart = sys.argv[1]
 
     # create directories inside container
-    dirv = ["/proc", "/sys", "/tmp", "/bin", "/sbin", "/lib", "/lib64",
-            "/usr/bin", "/usr/lib"]
+    dirv = ["/proc", "/sys", "/tmp",
+            "/bin", "/sbin", "/lib", "/lib64", "/usr/bin", "/usr/lib",
+            "/etc",
+            ]
     for _ in dirv:
         mkdir_p(slappart + _)
 
@@ -213,6 +215,9 @@ def main():
     bind("/usr/bin", slappart + "/usr/bin", MS_RDONLY)
     bind("/usr/lib", slappart + "/usr/lib", MS_RDONLY)
 
+    # XXX we need to setup some small /etc/{passwd,group} - else e.g. screen is not working
+    bind("/etc", slappart + "/etc", MS_RDONLY)
+
     # XXX sysfs and proc are somehow special - mount succeeds only after fork
     pid = os.fork()
     if pid != 0: