Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Merge "Change role of doctor user to _member_"
  - Change role of doctor user to _member_

    Change role of doctor user to _member_
    Do needful changes to API calls
    Add admin a role to project
    Add Fuel support

    JIRA: DOCTOR-80

    Change-Id: Ic7f88b9ceb6c4fc90e5e985ecfbc50c907b2367e
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index e3f9edb..51b2ad8 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit e3f9edb5064e280056addd6fc47535d3ee1a2435
+Subproject commit 51b2ad855f0dad6527e5ec436f6b29758c21fb80