BandwidthController: validate interface / chain names

Only allow alphanumeric, dashes, underscores, or colons in
interface and chain names. First character must be alphanumeric.

Bug: 14320836
Bug: 14323009
Change-Id: Ieac729719d0f9038f60c7afcb327f17d292d6ca6
(cherry picked from commit 0b2b9021ee27af2449c433fa13ed5c57e55dd816)
2 files changed