Add support for JRE provisioning: parameters support [phase 2]

[costin-zaharia-sonarsource]

Internal working document.

Our scanner does not currently fully support some scenarios. The bootstrapping asks for their support.

• [ ] sonar.scanner.truststorePath -> use in httpclient in provisioning and pass to the scanner.cli
• [ ] sonar.scanner.truststorePassword -> use in httpclient in provisioning and pass to the scanner.cli
• [ ] sonar.scanner.keystorePath -> use in httpclient in provisioning and pass to the scanner.cli (overlaps with our sonar.clientcert.path property)
• [ ] sonar.scanner.keystorePassword -> use in httpclient in provisioning and pass to the scanner.cli (overlaps with our sonar.clientcert.password property)
• [ ] sonar.scanner.proxyHost -> use in httpclient in provisioning and pass to the scanner.cli
• [ ] sonar.scanner.proxyUser -> use in httpclient in provisioning and pass to the scanner.cli
• [ ] sonar.scanner.proxyPassword -> use in httpclient in provisioning and pass to the scanner.cli

[martin-strecker-sonarsource]

See also #2121 We already have some parameters that would be duplicated by this issue, so we need a deprecation policy for these.