Solves issues dealing with pager for CLI

(cherry picked from commit 58af3b5ec9041ebee1bfc08b922359294ef19373)

src/cli/one_helper.rb

@@ -541,7 +541,10 @@ EOT
         def stop_pager(lpid)
             $stdout.close
 
-            Process.wait(lpid)
+            begin
+                Process.wait(lpid)
+            rescue Errno::ECHILD
+            end
         end
 
         def print_page(pool, options)
@@ -599,6 +602,9 @@ EOT
 
                 if elements < size
                     return 0
+                elsif !pool.is_paginated?
+                    stop_pager(ppid)
+                    return 0
                 end
 
                 # ------- Rest of the pages in the pool, piped to pager --------
@@ -613,6 +619,12 @@ EOT
 
                     current += size
 
+                    begin
+                        Process.waitpid(ppid, Process::WNOHANG)
+                    rescue Errno::ECHILD
+                        break
+                    end
+
                     elements, hash = print_page(pool, options)
 
                     table.show(hash, options)

src/oca/ruby/opennebula/pool.rb

@@ -247,5 +247,10 @@ module OpenNebula
 
             return rc 
         end
+
+        # Return true if pool is paginated
+        def is_paginated?
+            PAGINATED_POOLS.include?(@pool_name) 
+        end
     end
 end