For the TLS communication for AdminOps Api, httpclient is required and
filled with TLS certs, currently it is set to nil pointer in
`buckethealthchecker` and `cephobjectstoreuser`.
Thanks @Krast76 finding the issue even proposing the fix.
Fixes: #8132
Signed-off-by: Jiffin Tony Thottan <thottanjiffin@gmail.com>