#### Why I did it
1. Fix Build exception [example](https://dev.azure.com/mssonic/build/_build/results?buildId=73911&view=logs&jobId=88ce9a53-729c-5fa9-7b6e-3d98f2488e3f&j=cef3d8a9-152e-5193-620b-567dc18af272&t=ac3bce9f-b126-5a26-3fee-28ce0ec1679d)
```
2022-02-19T01:54:23.4200556Z ImportError: cannot import name 'soft_unicode' from 'markupsafe' (/usr/local/lib/python3.8/dist-packages/markupsafe/__init__.py)
```
This is because Jinja2 uses MarkupSafe without specifying an upper limit to the version, MarkupSafe version that was released today removed 'soft_unicode'. So now Jinja2 is complaining.
Related issues:
https://github.com/pallets/jinja/issues/1591https://github.com/aws/aws-sam-cli/issues/3661
2. Reverts #9136
Fixing build failures in SONiC utils [example](https://dev.azure.com/mssonic/build/_build/results?buildId=73784&view=logs&jobId=83516c17-6666-5250-abde-63983ce72a49&j=83516c17-6666-5250-abde-63983ce72a49&t=6177235f-d4f1-5f72-835a-90ebb93a1784)
One of the errors:
```
TestPathAddressing.test_find_ref_paths__ref_is_the_whole_key__returns_ref_paths
self = <tests.generic_config_updater.gu_common_test.TestPathAddressing testMethod=test_find_ref_paths__ref_is_the_whole_key__returns_ref_paths>
def test_find_ref_paths__ref_is_the_whole_key__returns_ref_paths(self):
# Arrange
path = "/PORT/Ethernet0"
expected = [
"/ACL_TABLE/NO-NSW-PACL-V4/ports/0",
"/VLAN_MEMBER/Vlan1000|Ethernet0",
]
# Act
actual = self.path_addressing.find_ref_paths(path, Files.CROPPED_CONFIG_DB_AS_JSON)
# Assert
> self.assertEqual(expected, actual)
E AssertionError: Lists differ: ['/ACL_TABLE/NO-NSW-PACL-V4/ports/0', '/VLAN_MEMBER/Vlan1000|Ethernet0'] != ['/ACL_TABLE/NO-NSW-PACL-V4/ports/0']
E
E First list contains 1 additional elements.
E First extra element 1:
E '/VLAN_MEMBER/Vlan1000|Ethernet0'
E
E - ['/ACL_TABLE/NO-NSW-PACL-V4/ports/0', '/VLAN_MEMBER/Vlan1000|Ethernet0']
E + ['/ACL_TABLE/NO-NSW-PACL-V4/ports/0']
```
The VLAN_MEMBER backlink (can be called referrer link or ref link) is not found.
Issue introduced by https://github.com/Azure/sonic-buildimage/pull/9136
I don't know how this PR passed the build system, it should have failed.
Known YANG issue https://github.com/Azure/sonic-buildimage/issues/9312
#### How I did it
The import to `sonic-vlan` is breaking the build
```
import sonic-vlan {
prefix vlan;
}
```
I am not sure if that's the only issue, so I think reverting the whole PR should be the safer option.
#### How to verify it
Ran sonic-utils tests locally.
f21a45b68a