Fix bug with multiple AuthenticationManager beans

[eleftherias]

There is no need to autowire the AuthenticationManager since we later get it from this.authenticationConfiguration.getAuthenticationManager().

spring-security/config/src/main/java/org/springframework/security/config/annotation/web/configuration/HttpSecurityConfiguration.java

Lines 104 to 107 in 7dde7cf

	private AuthenticationManager authenticationManager() throws Exception {
	return (this.authenticationManager != null) ? this.authenticationManager
	: this.authenticationConfiguration.getAuthenticationManager();
	}