Basic Auth not working for other users

Hi,
I am running Pinot in my test environment. I am following this link to configure basic auth for a user called `pinotuser` : https://docs.pinot.apache.org/operators/tutorials/authentication-authorization-and-acls
This user is not able to login via controller UI.

### `./conf/pinot-controller.conf` file contents:
```
pinot.service.role=CONTROLLER
pinot.cluster.name=pinot-quickstart
pinot.zk.server=localhost:2191
pinot.set.instance.id.to.hostname=true
controller.vip.host=worker1.virtual.machine
controller.host=worker1.virtual.machine
controller.data.dir=/tmp/pinot/data/controller
controller.tls.keystore.path=/root/apache-pinot-0.12.0-bin/certs/pinot-keystore
controller.tls.keystore.password=pinot123
controller.tls.client.auth=false
controller.access.protocols=https
controller.access.protocols.https.port=10000
controller.broker.protocol=https
controller.vip.protocol=https
controller.vip.port=10000
controller.admin.access.control.principals=admin,pinotuser
controller.admin.access.control.principals.admin.password=admin123
controller.admin.access.control.principals.pinotuser.password=pinot123
controller.admin.access.control.factory.class=org.apache.pinot.controller.api.access.BasicAuthAccessControlFactory
controller.admin.access.control.principals.pinotuser.tables=transcript
controller.admin.access.control.principals.pinotuser.permissions=READ
```

## Start zookeeper
```
bin/pinot-admin.sh StartZookeeper -zkPort 2191
```

## Start Controller
```
bin/pinot-admin.sh StartController-configFileName ./conf/pinot-controller.conf
```

## Expected Output
Both `admin` and `pinotuser` should be able to login. But `pinotuser` is not able to login. `admin` user works fine. However if I comment or remove last two lines in above controller configuration then `pinotuser` is able to login. In fact leaving any of the last two lines in config will make `pinotuser` fail to login

## Additional Info
Pinot version: apache-pinot-0.12.0
java version:
```
openjdk version "11.0.3" 2019-04-16
OpenJDK Runtime Environment 18.9 (build 11.0.3+7)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.3+7, mixed mode, sharing)
```

Start with conf/pinot-controller.conf and the BasicAuthAccessControlFactory configuration described in the issue. Reproduce the controller UI login failure using the supplied principal, table, and permission settings, then trace how those entries are applied; done means pinotuser can log in while retaining the requested table access and READ permission.

Written by the indexing model from the issue text.