[VPC]: fix port ranges for opentelekomcloud_networking_secgroup_rule_v2

[artem-lifshits]

Summary of the Pull Request

Port ranges were set every time even if they weren't provided by the user. This happened due to terraform being unable to differentiate empty parameter from zero value provided in config.

PR Checklist

• Refers to: Urgent Bug: opentelekomcloud_networking_secgroup_rule_v2 not working #2162
• Tests added/passed.
• Schema updated.
• Release notes added.

Acceptance Steps Performed

=== RUN   TestAccNetworkingV2SecGroupRule_basic
=== PAUSE TestAccNetworkingV2SecGroupRule_basic
=== CONT  TestAccNetworkingV2SecGroupRule_basic
--- PASS: TestAccNetworkingV2SecGroupRule_basic (42.93s)
=== RUN   TestAccNetworkingV2SecGroupRule_importBasic
=== PAUSE TestAccNetworkingV2SecGroupRule_importBasic
=== CONT  TestAccNetworkingV2SecGroupRule_importBasic
--- PASS: TestAccNetworkingV2SecGroupRule_importBasic (47.87s)
=== RUN   TestAccNetworkingV2SecGroupRule_timeout
=== PAUSE TestAccNetworkingV2SecGroupRule_timeout
=== CONT  TestAccNetworkingV2SecGroupRule_timeout
--- PASS: TestAccNetworkingV2SecGroupRule_timeout (42.56s)
=== RUN   TestAccNetworkingV2SecGroupRule_numericProtocol
=== PAUSE TestAccNetworkingV2SecGroupRule_numericProtocol
=== CONT  TestAccNetworkingV2SecGroupRule_numericProtocol
--- PASS: TestAccNetworkingV2SecGroupRule_numericProtocol (42.87s)
=== RUN   TestAccNetworkingV2SecGroupRule_noPorts
=== PAUSE TestAccNetworkingV2SecGroupRule_noPorts
=== CONT  TestAccNetworkingV2SecGroupRule_noPorts
--- PASS: TestAccNetworkingV2SecGroupRule_noPorts (42.17s)
=== RUN   TestAccNetworkingV2SecGroupRule_ICMP
=== PAUSE TestAccNetworkingV2SecGroupRule_ICMP
=== CONT  TestAccNetworkingV2SecGroupRule_ICMP
--- PASS: TestAccNetworkingV2SecGroupRule_ICMP (42.92s)
=== RUN   TestAccNetworkingV2SecGroupRule_noProtocolError
--- PASS: TestAccNetworkingV2SecGroupRule_noProtocolError (3.65s)
PASS

Process finished with the exit code 0

[otc-zuul]

Build succeeded.
https://zuul.otc-service.com/t/eco/buildset/f5dd569409b94c0cbc41289d1a692449

✔️ build-otc-releasenotes SUCCESS in 3m 24s
✔️ otc-golangci-lint SUCCESS in 2m 59s
✔️ golang-make-test SUCCESS in 3m 20s
✔️ golang-make-vet SUCCESS in 2m 46s
✔️ tflint SUCCESS in 1m 57s
✔️ goreleaser-build SUCCESS in 7m 53s