This patch introduced double registering of the same
config option groups which fails glance-api start
if reserved stores are actually defined.
The code utilizing these config options has not been
merged which prevented testing to catch this.
Closes-Bug: #1844108
This reverts commit 4265e61bc84ce9bd085a95d8734647f4875af740.
Change-Id: Iaf338d29673e68a15d37fdda81add552e4175634