aziotd crashes when no cache and network present

[sionik]

Hi,
i encountered a crash of aziotd.

This happens everytime if there is no cache and no network connection.

Backtrace:

[WARN] - Failed to send HTTP request (attempt 2 of 2): error trying to connect: dns error: failed to lookup address information: Temporary failu
[ERR!] - Failed to provision with IoT Hub, and no valid device backup was found: DPS client error
[ERR!] - service encountered an error
[ERR!] - caused by: DPS client error
[ERR!] - caused by: error trying to connect: dns error: failed to lookup address information: Temporary failure in name resolution
[ERR!] - caused by: dns error: failed to lookup address information: Temporary failure in name resolution
[ERR!] - caused by: failed to lookup address information: Temporary failure in name resolution
[ERR!] -    0: <aziotd::error::Error as core::convert::From<aziotd::error::ErrorKind>>::from
          at iot-identity-service/aziotd/src/error.rs:36:20
   <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/result.rs:2079:27
   aziotd::run::{{closure}}
          at iot-identity-service/aziotd/src/main.rs:200:34
   aziotd::main_inner::{{closure}}
          at iot-identity-service/aziotd/src/main.rs:64:14
1: aziotd::main::{{closure}}
          at iot-identity-service/aziotd/src/main.rs:25:36
   tokio::runtime::park::CachedParkThread::block_on::{{closure}}
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/park.rs:283:74
   tokio::runtime::coop::with_budget
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/coop.rs:107:5
   tokio::runtime::coop::budget
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/coop.rs:73:5
   tokio::runtime::park::CachedParkThread::block_on
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/park.rs:283:31
2: tokio::runtime::context::BlockingRegionGuard::block_on
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/context.rs:315:18
   tokio::runtime::scheduler::multi_thread::MultiThread::block_on
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/scheduler/multi_thread/mod.rs:68:14
   tokio::runtime::runtime::Runtime::block_on
          at root/.cargo/registry/src/pkgs.dev.azure.com-e5c519a815e3fea7/tokio-1.28.2/src/runtime/runtime.rs:304:50
3: aziotd::main
          at iot-identity-service/aziotd/src/main.rs:25:42
4: core::ops::function::FnOnce::call_once
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/ops/function.rs:250:5
   std::sys::backtrace::__rust_begin_short_backtrace
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/sys/backtrace.rs:152:18
5: std::rt::lang_start::{{closure}}
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/rt.rs:206:18
6: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/ops/function.rs:284:21
   std::panicking::catch_unwind::do_call
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panicking.rs:589:40
   std::panicking::catch_unwind
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panicking.rs:552:19
   std::panic::catch_unwind
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panic.rs:359:14
   std::rt::lang_start_internal::{{closure}}
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/rt.rs:175:24
   std::panicking::catch_unwind::do_call
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panicking.rs:589:40
   std::panicking::catch_unwind
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panicking.rs:552:19
   std::panic::catch_unwind
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panic.rs:359:14
   std::rt::lang_start_internal
          at rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/rt.rs:171:5
7: main
8: <unknown>
9: __libc_start_main
0: _start