BZ-1060747: remove weld extensions by using @Alternative

Conflicts:
	uberfire-api/src/main/java/org/uberfire/rpc/impl/SessionInfoImpl.java
	uberfire-security/uberfire-security-server/src/main/java/org/uberfire/security/server/auth/HttpAuthenticationManager.java
	uberfire-security/uberfire-security-server/src/main/resources/META-INF/beans.xml