feat(snap)!: Remove secrets-config proxy snap options

[farshidtz]

This feature allowed using snap options to:

1. add an admin user with its public key
2. replace the default API Gateway certificate

The ability to add users by public key has been removed in secrets-config v3. The remaining parts which are to replace default TLS certificate, is possible via other, more secure means. As a result, this feature along with all its complexity is being removed.

For more details, refer to canonical/edgex-snap-hooks#81 (comment)

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

New Dependency Instructions (If applicable)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
2.4% Duplication

[MonicaisHer]

I have tested setting up TLS with snap built from this PR:

$ snap install ./edgexfoundry_3.0.0-dev.128_amd64.snap --dangerous
edgexfoundry 3.0.0-dev.128 installed
$ sudo ./script.sh 
+ SERVER_CERT_FILE=server.crt
+ SERVER_KEY_FILE=server.key
+ SERVER_CSR_FILE=server.csr
+ CA_CERT_FILE=ca.crt
+ CA_KEY_FILE=ca.key
+ TEMP_DIR=/var/snap/edgexfoundry/common
+ openssl ecparam -name prime256v1 -genkey -noout -out ca.key
+ openssl req -new -x509 -sha256 -key ca.key -out ca.crt -subj /CN=local-ca
+ openssl ecparam -name prime256v1 -genkey -noout -out server.key
+ openssl req -new -sha256 -key server.key -out server.csr -subj /CN=localhost
+ openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 1000 -sha256
Certificate request self-signature ok
subject=CN = localhost
+ sudo cp server.crt server.key /var/snap/edgexfoundry/common/
+ sudo edgexfoundry.secrets-config proxy tls --inCert /var/snap/edgexfoundry/common/server.crt --inKey /var/snap/edgexfoundry/common/server.key --targetFolder /var/snap/edgexfoundry/current/nginx
+ sudo rm server.crt server.key
+ sudo snap restart --reload edgexfoundry.nginx
Restarted.
+ sleep 1
+ curl --cacert ca.crt -v https://localhost:8443/core-data/api/v2/ping
*   Trying 127.0.0.1:8443...
* Connected to localhost (127.0.0.1) port 8443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
*  CAfile: ca.crt
*  CApath: /etc/ssl/certs
* TLSv1.0 (OUT), TLS header, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS header, Finished (20):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.2 (OUT), TLS header, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: CN=localhost
*  start date: Apr 13 14:46:21 2023 GMT
*  expire date: Jan  7 14:46:21 2026 GMT
*  common name: localhost (matched)
*  issuer: CN=local-ca
*  SSL certificate verify ok.
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
> GET /core-data/api/v2/ping HTTP/1.1
> Host: localhost:8443
> User-Agent: curl/7.81.0
> Accept: */*
> 
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* Mark bundle as not supporting multiuse
< HTTP/1.1 401 Unauthorized
< Server: nginx
< Date: Thu, 13 Apr 2023 14:46:23 GMT
< Content-Type: text/html
< Content-Length: 172
< Connection: keep-alive
< 
<html>
<head><title>401 Authorization Required</title></head>
<body>
<center><h1>401 Authorization Required</h1></center>
<hr><center>nginx</center>
</body>
</html>
* Connection #0 to host localhost left intact