Logging improvements in CaptivePortalLoginActivity

Logging improvements to help debugging captive portal issues.

Test: manually tested
Bug: 33126342

(cherry picked from commit 87de0c206709d3a170649b535a973de8f9c0fb0c)

Change-Id: I52425b849412f6bd5c5ca1f0be7a49cc772497eb
1 file changed