* s3: set outbound bind IP before the first filer dial
Standalone weed s3 dialed the filer for GetFilerConfiguration before
SetOutboundLocalIP ran, so that gRPC conn was created with the stock
dialer and no source address. gRPC caches conns by address and reuses
the original dialer on reconnect, so the s3->filer connection kept
leaving from the OS-chosen source for the life of the process even
after the bind IP was set a moment later.
* grpc: install the outbound-bind dialer unconditionally
The dialer was installed only when OutboundLocalAddr was already set at
GrpcDial time, baking the source-address decision into the cached conn,
so a conn dialed before the bind IP was configured never bound.
Install the context dialer always and decide per dial: bind through
OutboundDialContext once a source is set, otherwise fall back to the
stock net.Dialer so default deployments keep gRPC's dial timeout and
keepalive behavior. The bind now applies on the next reconnect
regardless of ordering, matching the HTTP transport's unconditional
DialContext.
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