Update git submodules
* Update charm-keystone-ldap from branch 'master'
to 9ea002f720330ba1201617e66fa52292afd31073
- Merge "rebuild - restore c-h proxy env vars for add-apt-repository"
- rebuild - restore c-h proxy env vars for add-apt-repository
Change-Id: I60bb99db99dee0f9d160dcb313bbcda1f788c50a
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