Use only valid services

[kbarbounakis]

Is your feature request related to a problem? Please describe.
ServiceConfiguration should omit services marked as -serviceType or ignoreServiceType etc and get only services that follow service configuration schema e.g.

 {
    "serviceType": "./my-module#MyService",
    "strategyType": "./my-module#MyStrategy"
}

or

 {
    "serviceType": "./my-module#MyService"
}