Add allow_out_ports (#3796)

Follow changes in the CVM builder

### Description

Follow changes in the CVM builder

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Quick tests passed locally by running `./runtest.sh`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated.

Author: YuanTingHsieh

examples/advanced/cc_provision/cc_server1.yml

@@ -11,8 +11,8 @@ user_data_drive_size: 1
 # docker save <image_name> | gzip > app.tar.gz
 docker_archive: /tmp/base_images/app.tar.gz
 
-allowed_ports:
-- 8002
+allowed_ports: [8002]
+allowed_out_ports: [443, 8999]
 
 cc_issuers:
   - id: snp_authorizer

examples/advanced/cc_provision/cc_site-1.yml

@@ -15,6 +15,7 @@ docker_archive: /tmp/base_images/app.tar.gz
 # for debugging purpose
 # hosts_entries:
 #   server1: 1.2.3.4
+allowed_out_ports: [443, 8002, 8999]
 
 cc_issuers:
   - id: snp_authorizer