rook: Objectstore: s3cmd make bucket returns error InvalidLocationConstraint

Is this a bug report or feature request?

• Bug Report

Deviation from expected behavior: Following installation of rook master branch with objectstore, there is an error when creating a bucket:

s3cmd mb s3://bkt
ERROR: S3 error: 400 (InvalidLocationConstraint)

This is a regressing from release-0.9 branch where the s3 make bucket command succeeds.

Expected behavior: s3cmd is able to create buckets

s3cmd mb s3://bkt
Bucket 's3://bkt/' created

How to reproduce it (minimal and precise):

minishift start --disk-size 40g --memory 8GB --cpus 8 -v99
minishift ssh "sudo mkdir /mnt/sda1/var/lib/rook;sudo ln -s /mnt/sda1/var/lib/rook /var/lib/rook"
oc login -u system:admin
oc create -f ./common.yaml
oc create -f ./operator-openshift.yaml
vim ./cluster.yaml
    config:
      storeType: filestore
# Cluster level list of directories
    directories:
    - path: /var/lib/rook
:wq
oc create -f ./cluster.yaml

vim ./object-openshift.yaml
spec:
  # The pool spec used to create the metadata pools. Must use replication.
  metadataPool:
    failureDomain: host
    replicated:
      size: 1
  # The pool spec used to create the data pool. Can use replication or erasure coding.
  dataPool:
    failureDomain: host
    replicated:
      size: 1
:wq
oc create -f ./object-openshift.yaml
oc create -f ./object-user.yaml

oc create -f ./toolbox.yaml
oc -n rook-ceph exec -it $(oc -n rook-ceph get pod -l "app=rook-ceph-tools" -o jsonpath='{.items[0].metadata.name}') bash

[root@minishift /]# yum install -y s3cmd

[root@minishift /]# radosgw-admin user create --display-name="COSBench_user" --uid=cosbench --access-key b2345678901234567890 --secret b234567890123456789012345678901234567890 | jq

[root@minishift /]# s3cmd --configure
[root@minishift /]# s3cmd mb s3://bkt
ERROR: S3 error: 400 (InvalidLocationConstraint)

Environment:

• OS (e.g. from /etc/os-release): RHEL 7.6
• Kernel (e.g. uname -a): 3.10.0-957.10.1.el7.x86_64
• Cloud provider or hardware configuration: N/A
• Rook version (use rook version inside of a Rook Pod): rook: v0.9.0-362.g69936c1

git branch -vv                                                                   
* master      69936c1 [origin/master] Merge pull request #2676 from colonwq/pr2660 

• Kubernetes version (use kubectl version):

oc version                                  
oc v3.11.0+0cbc58b                            
kubernetes v1.11.0+d4cacc0                    
features: Basic-Auth GSSAPI Kerberos SPNEGO   
                                              
Server https://192.168.42.14:8443             
kubernetes v1.11.0+d4cacc0                    

• Kubernetes cluster type (e.g. Tectonic, GKE, OpenShift): minishift-1.33.0-linux-amd64.tgz
• Storage backend status (e.g. for Ceph use ceph health in the [Rook Ceph toolbox] (https://rook.io/docs/Rook/master/toolbox.html)):

[root@minishift /]# ceph -s                       
  cluster:                                        
    id:     34a39b63-57b6-463a-9624-a0d1414fbba8  
    health: HEALTH_OK                             
                                                  
  services:                                       
    mon: 3 daemons, quorum b,c,a                  
    mgr: a(active)                                
    osd: 1 osds: 1 up, 1 in                       
    rgw: 1 daemon active                          
                                                  
  data:                                           
    pools:   6 pools, 600 pgs                     
    objects: 205  objects, 4.2 KiB                
    usage:   9.7 GiB used, 28 GiB / 38 GiB avail  
    pgs:     600 active+clean