Errors in Bootstrapper.start are logged to System.out if logging failed to initialize
Merge pull request #3634 from lutovich/2.1-npe-in-bootstrapper-catch-block

Null-safe logging in Bootstrapper
Merge '2.1-maint' un 'master'

Conflicts:
	community/server/src/main/java/org/neo4j/server/Bootstrapper.java