FRR 7.5 YANG validation error with libyang 1.0.215

[vifino]

Describe the bug

1. Download Alpine 3.13
2. Install FRR 7.5 (apk add frr)
3. Upgrade to Alpine Edge or fetch libyang-1.0.215-r0.apk from edge/community.
4. Start FRR.
5. Open vtysh in config mode, create a route-map with set src statement.

host# configure
host(config)# route-map SET-SRC permit 1
host(config-route-map)# set src 2a0e:9b42:dead::
% Configuration failed.

Error type: validation
Error description: YANG error(s):
 When condition "./action = 'source'" not satisfied.
 YANG path: /frr-route-map:lib/route-map[name='SET-SRC']/entry[sequence='1']/set-action[action='source']/frr-zebra:source-v4

Expected behavior

No validation errors, config should work exactly as with libyang 1.0.184.

Versions

• OS Version: Alpine Edge
• Kernel: 5.10.31
• FRR Version: 7.5

[idryzhov]

Fixed in #8533