Always use the same short option for iallocator

This patch changes the scripts so that the short name for the
“--iallocator” option is always ‘-I’.

Reviewed-by: ultrotter

scripts/gnt-instance

@@ -1420,7 +1420,7 @@ commands = {
                                  help=("Comma-separated list of disks"
                                        " to replace (e.g. sda) (optional,"
                                        " defaults to all disks")),
-                     make_option("-i", "--iallocator", metavar="<NAME>",
+                     make_option("-I", "--iallocator", metavar="<NAME>",
                                  help="Select new secondary for the instance"
                                  " automatically using the"
                                  " <NAME> iallocator plugin (enables"
@@ -1428,7 +1428,7 @@ commands = {
                                  default=None, type="string"),
                      SUBMIT_OPT,
                      ],
-                    "[-s|-p|-n NODE] <instance>",
+                    "[-s|-p|-n NODE|-I NAME] <instance>",
                     "Replaces all disks for the instance"),
   'modify': (SetInstanceParams, ARGS_ONE,
              [DEBUG_OPT, FORCE_OPT,

scripts/gnt-node

@@ -495,13 +495,13 @@ commands = {
                 make_option("-n", "--new-secondary", dest="dst_node",
                             help="New secondary node", metavar="NODE",
                             default=None),
-                make_option("-i", "--iallocator", metavar="<NAME>",
+                make_option("-I", "--iallocator", metavar="<NAME>",
                             help="Select new secondary for the instance"
                             " automatically using the"
                             " <NAME> iallocator plugin",
                             default=None, type="string"),
                 ],
-               "[-f] {-i <iallocator> | -n <dst>} <node>",
+               "[-f] {-I <iallocator> | -n <dst>} <node>",
                "Relocate the secondary instances from a node"
                " to other nodes (only for instances with drbd disk template)"),
   'failover': (FailoverNode, ARGS_ONE,