fix: app cmd parsing, usage & tests

Note: the integration tests don't work due to ValidateApp still
attempting to validate the host key for the test app which doesn't
exist. This will be fixed in a future commit.

cli/internal/cli.go

@@ -353,6 +353,21 @@ var AllTagsFlag = &cli.BoolFlag{
 	Destination: &AllTags,
 }
 
+var LocalCmd bool
+var LocalCmdFlag = &cli.BoolFlag{
+	Name:        "local, l",
+	Usage:       "Run command locally",
+	Destination: &LocalCmd,
+}
+
+var RemoteUser string
+var RemoteUserFlag = &cli.StringFlag{
+	Name:        "user, u",
+	Value:       "",
+	Usage:       "User to run command within a service context",
+	Destination: &RemoteUser,
+}
+
 // SSHFailMsg is a hopefully helpful SSH failure message
 var SSHFailMsg = `
 Woops, Abra is unable to connect to connect to %s.