inaccurate error message in validating required attribute with alternatives

This is created based on comments in JBEAP-8666

failure message is inaccurate and points out only that ssl-context must be defined, it should also mention the security-realm as one of the options.

/subsystem=undertow/server=default-server/https-listener=aaa:add(socket-binding=ajp)                                 
{
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0172: ssl-context is required",
    "rolled-back" => true
}