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>

performance-metrics/src/performance_tests.rs

@@ -359,11 +359,13 @@ pub fn performance_block_io(control: &PerformanceTestControl) -> f64 {
                 guest.disk_config.disk(DiskType::OperatingSystem).unwrap()
             )
             .as_str(),
+            "--disk",
             format!(
                 "path={}",
                 guest.disk_config.disk(DiskType::CloudInit).unwrap()
             )
             .as_str(),
+            "--disk",
             format!("path={BLK_IO_TEST_IMG}").as_str(),
         ])
         .default_net()