B #3390: Use LXD REST exec on reconfigure. Update odd hash deletion

(cherry picked from commit 03559900ca4a735cf33de84756e9c556d9e97516)

src/vmm_mad/remotes/lib/lxd/container.rb

@@ -170,13 +170,24 @@ class Container
         @lxc = @client.get("#{CONTAINERS}/#{name}")['metadata']
     end
 
-    # Runs command inside container
+    # Runs command inside container using the LXD CLI
     # @param command [String] to execute through lxc exec
     def exec(command)
         cmd = "#{@lxc_command} exec #{@one.vm_name} -- #{command}"
         Command.execute(cmd, true)
     end
 
+    # Runs command inside container using REST. Execution isn't managed.
+    # @param full command [String] to execute
+    def exec_rest(command)
+        body = { 'command'              => command.split(' '),
+                 'wait-for-websocket'   => false,
+                 'record-output'        => false,
+                 'interactive'          => false }
+
+        @client.post("#{CONTAINERS}/#{name}/exec", body)
+    end
+
     def show_log
         cmd = "#{@lxc_command} info --show-log #{@lxc['name']}"
         rc, o, e = Command.execute(cmd, false)
@@ -325,7 +336,7 @@ class Container
 
         csrc = @lxc['devices']['context']['source'].clone
 
-        @lxc['devices'].delete('context')['source']
+        @lxc['devices'].delete('context')
 
         update
 
@@ -374,7 +385,7 @@ class Container
             container devices\n#{@lxc['devices']}"
         end
 
-        @lxc['devices'].delete(disk_name)['source']
+        @lxc['devices'].delete(disk_name)
 
         update
 

src/vmm_mad/remotes/lxd/reconfigure

@@ -40,6 +40,4 @@ container = Container.get(vm_name, xml, client)
 
 raise 'Failed to attach context' unless container.attach_context
 
-rc, _out, err = container.exec('service one-context-reconfigure restart')
-
-OpenNebula.log_error "Failed to run recontextualization service \n#{err}" unless rc.zero?
+container.exec_rest('service one-context-reconfigure restart')