IDEA-123972 Display JIRA version under JQL editor field in settings
Rename classes related to legacy JIRA interface to not cause confusion anymore
Add workaround for CertificateManager *service* to work with old task connectors

Service is initialized as soon as HTTP client is needed in BaseRepositoryImpl.
Newer connectors written with httpclient  4.x as well as other clients (REST client plugin and VFS)
don't require it though because SSL context is set explicitly there
 (see NewBaseRepositoryImpl#getHttpClient for example).