bash8: fix bash8 warning
bash8: fix bash8 warning

This patch removes the following bash8 warnings.

> /devstack/ $ ./run_tests.sh
> Running bash8...
> E003: Indent not multiple of 4: '             wget -c $image_url -O $FILES/$IMAGE_FNAME'
>  - functions: L1367
> E003: Indent not multiple of 4: '             if [[ $? -ne 0 ]]; then'
>  - functions: L1368
> E003: Indent not multiple of 4: '                 echo "Not found: $image_url"'
>  - functions: L1369
> E003: Indent not multiple of 4: '                 return'
>  - functions: L1370
> E003: Indent not multiple of 4: '             fi'
>  - functions: L1371
> E003: Indent not multiple of 4: '                                 `"should use a descriptor-data pair."'
>  - functions: L1423
> E003: Indent not multiple of 4: '                         `" Attempt to retrieve the *-flat.vmdk: $flat_url"'
>  - functions: L1438
> E003: Indent not multiple of 4: '                             `" Attempt to retrieve the descriptor *.vmdk: $descriptor_url"'
>  - functions: L1477
> E003: Indent not multiple of 4: '                         warn $LINENO "Descriptor not found $descriptor_url"'
>  - functions: L1492
> E003: Indent not multiple of 4: '                         descriptor_found=false'
>  - functions: L1493
> E003: Indent not multiple of 4: '                 fi'
>  - functions: L1501
> E003: Indent not multiple of 4: '             fi'
>  - functions: L1502
> E003: Indent not multiple of 4: '             #TODO(alegendre): handle streamOptimized once supported by the VMware driver.'
>  - functions: L1503
> E003: Indent not multiple of 4: '             vmdk_disktype="preallocated"'
>  - functions: L1504
> 14 bash8 error(s) found

Change-Id: Icf2cddf283192a50253ccfa697c2d32eec75b4ba
Closes-Bug: #1267716

bq-xiao/devstack,bswartz/devstack,sc68cal/devstack,prithivm/branch01,mc2014/devstack,CloudServer/devstack,HPCHub/devstack,flavio-fernandes/devstack,LoHChina/devstack,eharney/devstack,sc68cal/devstack,bljgaurav/openstack-test,noironetworks/devstack,varunarya10/devstack,pczerkas/devstack,TwinkleChawla/devstack,wenhuizhang/devstack,costingalan/devstack,dirkmueller/devstack,olivierlemasle/devstack,virtualopensystems/devstack,thomasem/devstack,mmasaki/devstack,andrewrothstein/devstack,nawawi/openstack,liuquansheng47/devstack,herrsechs/devstack,pombredanne/devstack,williamthegrey/devstack,mc2014/devstack,mmasaki/devstack,j4/devstack,olivierlemasle/devstack,vishnugonela/devstack,bigswitch/devstack,BSJAIN92/OpenStack,BSJAIN92/OpenStack,jamielennox/devstack,flavio-fernandes/devstack,CloudServer/devstack,NaokiMiyata/devstack,neerja28/Devstack_GlusterFS,HPCHub/devstack,NaokiMiyata/devstack,bswartz/devstack,sequenceiq/devstack,Millnert/contrail-devstack,liuquansheng47/devstack,pczerkas/devstack,Mahito/devstack,innodee/openstackk,upadhyay-prashant/devstack,atulpatil301/devstack,vsham20/devstack,andrewrothstein/devstack,wenhuizhang/devstack,dtroyer/devstack,JioCloud/devstack,tianweizhang/devstack,yamt/devstack,nuxeh/devstack,group-policy/devstack,openstack-dev/devstack,Juniper/devstack,rushiagr/devstack,pacinete/devstack,parul24/devstack,mssumanth/devstack,affo/devstack,Mahito/devstack,noironetworks/devstack,bljgaurav/openstack-test,atulpatil301/devstack,bq-xiao/devstack,rushiagr/devstack,j4/devstack,ozamiatin/devstack,vsham20/devstack,group-policy/devstack,neerja28/Devstack_GlusterFS,dirkmueller/devstack,avvocatodemarchis/devstack,eshnil2000/devstack,sequenceiq/devstack,mssumanth/devstack,promptworks/devstack,thomasem/devstack,herrsechs/devstack,kplus/devstack-moonshot,kplus/devstack-moonshot,upadhyay-prashant/devstack,samgoon/devstack,richliu/devstack,promptworks/devstack,vishnugonela/devstack,richliu/devstack,prithivm/branch01,nawawi/openstack,pacinete/devstack,srics/devstack,LoHChina/devstack,bigswitch/devstack,openstack-dev/devstack,affo/devstack,dtroyer/devstack,varunarya10/devstack,parul24/devstack,eharney/devstack,avvocatodemarchis/devstack,costingalan/devstack,samgoon/devstack,tianweizhang/devstack,pombredanne/devstack,nuxeh/devstack,TwinkleChawla/devstack,ozamiatin/devstack