main: switch to argh

A few breaking changes:

1. `-vvv` needs to be written as `-v -v -v`.
2. `--disk D1 D2` and others need to be written as `--disk D1 --disk D2`.
3. `--option=value` needs to be written as `--option value`

Change integration tests to adapt to the breaking changes.

Signed-off-by: Wei Liu <liuwe@microsoft.com>

Cargo.lock

@@ -178,7 +178,6 @@ dependencies = [
  "anyhow",
  "api_client",
  "argh",
- "clap",
  "dirs",
  "epoll",
  "event_monitor",
@@ -1575,7 +1574,6 @@ dependencies = [
  "arch",
  "bitflags",
  "block_util",
- "clap",
  "devices",
  "epoll",
  "event_monitor",