Bootstrap fails w/ NPE - PolarisApplicationConfig.serviceLocator is null

[snazy]

Describe the bug

After adding fixes for #560, #561, #562, there's another new NPE that prevents bootstrap w/ eclipselink:

java.lang.NullPointerException: Cannot invoke "org.glassfish.hk2.api.ServiceLocator.getService(java.lang.Class, java.lang.annotation.Annotation[])" because "this.serviceLocator" is null
        at org.apache.polaris.service.dropwizard.config.PolarisApplicationConfig.findService(PolarisApplicationConfig.java:189)
	at org.apache.polaris.service.dropwizard.BootstrapRealmsCommand.run(BootstrapRealmsCommand.java:50)
	at org.apache.polaris.service.dropwizard.BootstrapRealmsCommand.run(BootstrapRealmsCommand.java:37)
	at io.dropwizard.core.cli.ConfiguredCommand.run(ConfiguredCommand.java:98)
	at io.dropwizard.core.cli.Cli.run(Cli.java:78)
	at io.dropwizard.core.Application.run(Application.java:94)
	at org.apache.polaris.service.dropwizard.PolarisApplication.main(PolarisApplication.java:154)

I'm not sure whether it's worth to fix all these issues but instead wait for #469.

To Reproduce

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Actual Behavior

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Expected Behavior

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Additional context

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System information

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