Do not save exception in a variable if it isn't referenced

Prior to this commit there were a couple locations where exceptions were
saved to `_e` but weren't used in the handler except to re-raise the
exception, which simply calling the `raise` keyword will do without a
provided argument.
This commit removes the unnecessary assignment of the exception to a
variable and simply uses `raise` instead.

lib/vmpooler/pool_manager.rb

@@ -330,11 +330,11 @@ module Vmpooler
         $logger.log('s', "[+] [#{pool_name}] '#{new_vmname}' cloned in #{finish} seconds")
 
         $metrics.timing("clone.#{pool_name}", finish)
-      rescue StandardError => _e
+      rescue StandardError
         $redis.srem("vmpooler__pending__#{pool_name}", new_vmname)
         expiration_ttl = $config[:redis]['data_ttl'].to_i * 60 * 60
         $redis.expire("vmpooler__vm__#{new_vmname}", expiration_ttl)
-        raise _e
+        raise
       ensure
         $redis.decr('vmpooler__tasks__clone')
       end
@@ -1153,7 +1153,7 @@ module Vmpooler
 
       begin
         inventory = create_inventory(pool, provider, pool_check_response)
-      rescue StandardError => e
+      rescue StandardError
         return(pool_check_response)
       end
 

lib/vmpooler/providers/vsphere.rb

@@ -173,9 +173,9 @@ module Vmpooler
               target[dc]['checking'] = true
               hosts_hash = find_least_used_hosts(cluster, datacenter, percentage)
               target[dc] = hosts_hash
-            rescue StandardError => _e
+            rescue StandardError
               target[dc] = {}
-              raise(_e)
+              raise
             ensure
               target[dc]['check_time_finished'] = Time.now
             end
@@ -344,11 +344,11 @@ module Vmpooler
             begin
               vm_target_folder = find_vm_folder(pool_name, connection)
               vm_target_folder = create_folder(connection, target_folder_path, target_datacenter_name) if vm_target_folder.nil? && @config[:config].key?('create_folders') && (@config[:config]['create_folders'] == true)
-            rescue StandardError => _e
+            rescue StandardError
               if @config[:config].key?('create_folders') && (@config[:config]['create_folders'] == true)
                 vm_target_folder = create_folder(connection, target_folder_path, target_datacenter_name)
               else
-                raise(_e)
+                raise
               end
             end
 
@@ -986,9 +986,9 @@ module Vmpooler
               else
                 logger.log('s', "[ ] [#{pool_name}] '#{vm_name}' is running on #{vm_hash['host_name']}")
               end
-            rescue StandardError => _e
+            rescue StandardError
               logger.log('s', "[!] [#{pool_name}] '#{vm_name}' is running on #{vm_hash['host_name']}")
-              raise _e
+              raise
             end
           end
         end