Migragtes swift-internal urls to swift urls

Savanna dashboard code now uses swift:// instead of swift-internal://. Also updated
in panel documentation and refactored functions referring to swift as swift-internal.

Implements: blueprint: swift-url-proto-cleanup-deprecations
Change-Id: Ibcbe8bfaea592ec1861ad4db929e531d60468084
Merge "Migragtes swift-internal urls to swift urls"