az storage account generate-sas creating invalid token (Expiry format incorrect)

Expiry portion of the SAS token ends up like:
`se=2019-12-12T03%3A21%3A25Z`

Where it should be like:
`se=2019-12-12T03:21:25Z`

I have no idea where that format is valid but for most practical uses it seems like complete gibberish (e.g if passing token to azcopy)

Furthermore az cli should generate sas tokens in identical format to the Azure Portal for consistency sake.
Azure Portal generated SAS:
`?sv=2019-02-02&ss=bfqt&srt=sco&sp=rwdlacup&se=2119-11-12T10:31:28Z&st=2019-11-12T02:31:28Z&spr=https&sig=REDACTED`

Azure CLI generated SAS:
`se=2019-12-12T03%3A21%3A25Z&sp=rwdlacup&sv=2018-03-28&ss=bqtf&srt=sco&sig=REDACTED`

**Command Name**
`az storage account generate-sas`

- `az storage account generate-sas --account-name {} --services {} --permissions {} --resource-type {} --expiry {} --output {}`

## Environment Summary
```
Linux-5.3.7-050307-generic-x86_64-with-debian-buster-sid
Python 3.6.5
Shell: bash

azure-cli 2.0.76

Extensions:
interactive 0.4.3

```