docker: update following name changes:

`backend_e2e` now print properly backend logs

docker/backend-dev-e2e/certificates/README

@@ -0,0 +1,12 @@
+Those certificates are used to activate TLS for end-2-end testing (to be as
+close as possible as production environment), they are used in other containers
+needing TLS certificates (notably Prosody).
+
+To generate them, minica has been used. Minica can be found at https://github.com/jsha/minica.
+
+The following commands have been used:
+
+$ minica --domains "server1.test,*.server1.test,server2.test,server3.test,libervia-backend.test,libervia-web.test"
+$ chmod 0644 minica.pem server1.test/cert.pem && chmod 0640 server1.test/key.pem
+
+Note that certificates are valid for 2 years and 30 days, so they must be renewed after this delay.

docker/backend-dev-e2e/certificates/minica-key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAvO1Mq06trCFWhsFzX9nBV+2/jJLJ0ishn5VkbeWkayXf609t
+5Lg6cQealXMvAjPYK9Kuy4patmJ0iMT53/x6rmfbhbcp40Licuc7RGrpcNgbllAA
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+-----END RSA PRIVATE KEY-----

docker/backend-dev-e2e/certificates/minica.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDSzCCAjOgAwIBAgIIYcWiSXEWKycwDQYJKoZIhvcNAQELBQAwIDEeMBwGA1UE
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+-----END CERTIFICATE-----

docker/backend-dev-e2e/certificates/server1.test/cert.pem

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDijCCAnKgAwIBAgIITwyWOI+1bQ8wDQYJKoZIhvcNAQELBQAwIDEeMBwGA1UE
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+-----END CERTIFICATE-----

docker/backend-dev-e2e/certificates/server1.test/key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----