Update keystone process diagram

Fixed font rendering in the png file. Related to https://review.openstack.org/#/c/222034/

Change-Id: I3aaa37ad23a0d4b76fe6fd464f95f382ca5087e6

doc/common-rst/figures/SCH_5002_V00_NUAC-Keystone.svg

@@ -21,7 +21,7 @@
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@@ -39,13 +39,13 @@
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@@ -248,7 +248,7 @@
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