Linux.runCommand() and Linux.putFile() are now non-synchronized

Helper methods of Linux class were always synchronized and thus could
not be run concurrently even on different VMs/agents.

This has been addressed by applying a properly parametrized
io.murano.metadata.engine.Synchronize meta attribute to these methods,
so now they are synchronized only if executed for the same agent
arguments.

Change-Id: Ibf129316a092ba0231cd5445b688d6d5689c2256
Closes-bug: #1611332

meta/io.murano/Classes/configuration/Linux.yaml

@@ -14,11 +14,15 @@ Namespaces:
   =: io.murano.configuration
   std: io.murano
   sys: io.murano.system
+  m: io.murano.metadata.engine
 
 Name: Linux
 
 Methods:
   runCommand:
+    Meta:
+      - m:Synchronize:
+          onArgs: agent
     Usage: Static
     Arguments:
       - agent:
@@ -59,6 +63,9 @@ Methods:
 
   putFile:
     Usage: Static
+    Meta:
+      - m:Synchronize:
+          onArgs: agent
     Arguments:
       - agent:
           Contract: $.class(sys:Agent)

releasenotes/notes/linux-helpers-async-243fc1adbbe5c512.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Helper methods of Linux class now can be run concurrently if executed for
+    different VM agents.