main: switch command parsing to use clap

Partially revert 111225a2a5
and add the new dbus and pvpanic arguments.

As we are switching back to clap observe the following changes.

A few examples:

1. `-v -v -v` needs to be written as`-vvv`
2. `--disk D1 --disk D2` and others need to be written as `--disk D1 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>
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@intel.com>

test_infra/src/lib.rs

@@ -1152,7 +1152,7 @@ impl ToString for VerbosityLevel {
         match self {
             Warn => "".to_string(),
             Info => "-v".to_string(),
-            Debug => "-v -v".to_string(),
+            Debug => "-vv".to_string(),
         }
     }
 }
@@ -1203,7 +1203,7 @@ impl<'a> GuestCommand<'a> {
                 self.command.arg("-v");
             }
             Debug => {
-                self.command.args(["-v", "-v"]);
+                self.command.args(["-vv"]);
             }
         };
 
@@ -1271,7 +1271,6 @@ impl<'a> GuestCommand<'a> {
                         .unwrap()
                 )
                 .as_str(),
-                "--disk",
                 format!(
                     "path={}",
                     self.guest.disk_config.disk(DiskType::CloudInit).unwrap()