LWM2M: Remove finished bootstrap connection
LWM2M: Remove finished bootstrap connection

This patch fixes a bug by removing the call to
sol_vector_clear(&conn_ctx->server_addr_list); inside bootstrap_request_reply()
and inserting a call to remove this connection from the client's connection
list inside bootstrap_finish(). This way, the connection is only (and properly)
removed after the Bootstrap Process has finished.

Signed-off-by: Bruno Melo <5896b2877280b608dc9084a8dc909bfd4549a504@gmail.com>

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