Revert "Remove vendored libjuju"

This reverts commit 9d18c22a0dc9e295adda50601fc5e2f45d2c9b8a.

Change-Id: I7dbf291ccd750c5f836ff80c642be492434ab3ac
Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/modules/libjuju/docs/requirements.txt b/modules/libjuju/docs/requirements.txt
new file mode 100644
index 0000000..dabf3a0
--- /dev/null
+++ b/modules/libjuju/docs/requirements.txt
@@ -0,0 +1,5 @@
+pytz<2018.0,>=2017.2  # conflict between sphinx and macaroonbakery
+pymacaroons>=0.13.0,<1.0  # force new version with pynacl instead of libnacl
+sphinx==1.6.5
+sphinxcontrib-asyncio
+sphinx_rtd_theme