Add import/export version 2 design document

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Makefile.am

@@ -275,6 +275,7 @@ docrst = \
 	doc/design-query2.rst \
 	doc/design-x509-ca.rst \
 	doc/design-http-server.rst \
+	doc/design-impexp2.rst \
 	doc/cluster-merge.rst \
 	doc/design-shared-storage.rst \
 	doc/devnotes.rst \

doc/design-draft.rst

@@ -7,6 +7,7 @@ Design document drafts
 
    design-x509-ca.rst
    design-http-server.rst
+   design-impexp2.rst
 
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