Refactor upgrade execution path to avoid unnecessary OSGi service registrations

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Discarded
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Core Infrastructure, Core Infrastructure > DB Upgrade Client, Core Infrastructure > Upgrade Framework
• Labels: None
• Priority Level: Low
• Git Pull Request: https://github.com/shuyangzhou/liferay-portal/pull/5981

Refactor upgrade execution path to avoid unnecessary OSGi service registrations.