Load host settings in connect_ to ensure they are valid for every connection.
Load host settings in connect_ to ensure they are valid for every connection.

Previously, they were loaded only in start, which led to them being invalid
for reconnections where a JID change required that the host_ member be refreshed.

BUG=592068

Review URL: https://codereview.chromium.org/1765643003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#379414}

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