repo rework: Remove need for repos to be self-aware

* See #12917 for details.
* Squashed to one commit to make revert easy if we
  run into any issues.
* pkgman is now pre-attached to the 'current' repo
  version within nightly images so they can be updated
  by default.
* This shouldn't impact us keeping older sets of package
  versions by commit hash for building older hrevs.
* There are XXX stubs with "Kill me". These will need
  to be dropped after users are given sufficent time to
  upgrade. We're dropping a previously required field (url)
  so making this a slowish roll out.
* Makes the repos a lot less restrictive which should
  help PM package building automation be a bit easier.
* Once this stuff smooths out, we'll add UUID's to the
  repo definitions for duplicate repo detection.

headers/os/package/RepositoryInfo.h

@@ -33,7 +33,6 @@ public:
 			status_t			InitCheck() const;
 
 			const BString&		Name() const;
-			const BString&		OriginalBaseURL() const;
 			const BString&		Vendor() const;
 			const BString&		Summary() const;
 			uint8				Priority() const;
@@ -42,7 +41,6 @@ public:
 			const BStringList&	LicenseTexts() const;
 
 			void				SetName(const BString& name);
-			void				SetOriginalBaseURL(const BString& url);
 			void				SetVendor(const BString& vendor);
 			void				SetSummary(const BString& summary);
 			void				SetPriority(uint8 priority);
@@ -57,8 +55,10 @@ public:
 
 	static	const uint8			kDefaultPriority;
 
+	// XXX: Kill me after everyone upgrades
+	static  const char* const	kURLField;
+
 	static	const char* const	kNameField;
-	static	const char* const	kURLField;
 	static	const char* const	kVendorField;
 	static	const char*	const	kSummaryField;
 	static	const char*	const	kPriorityField;
@@ -74,7 +74,6 @@ private:
 			status_t			fInitStatus;
 
 			BString				fName;
-			BString				fOriginalBaseURL;
 			BString				fVendor;
 			BString				fSummary;
 			uint8				fPriority;