loosen ice-ufrag/ice-pwd ice-char restrictions further
loosen ice-ufrag/ice-pwd ice-char restrictions further

Loosen the restrictions for ice-char by also allowing
'#' (known to break) and '_' (urlsafe base64) in addition
to the existing exceptions for '-' and '='.
Also fixes typo in log message.

BUG=chromium:1053756

Change-Id: I8f254a7c25f780276452fa3e27245b6b7ad1a3ce
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168943
Reviewed-by: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Reviewed-by: Harald Alvestrand <ce816cd73d80f958d82de1df356058c2d2bca378@webrtc.org>
Commit-Queue: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#30596}

ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc