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.toml

@@ -27,7 +27,6 @@ strip = true
 anyhow = "1.0.68"
 api_client = { path = "api_client" }
 argh = "0.1.9"
-clap = { version = "4.0.32", features = ["wrap_help","cargo","string"] }
 epoll = "4.3.1"
 event_monitor = { path = "event_monitor" }
 hypervisor = { path = "hypervisor" }