Fix parsing of "-a" in various contexts.

Fix parsing of "-a" in various contexts.

From: Doug Ledford <dledford@redhat.com>

This one fixes a bug where once manage mode is set, the -a short option
is no longer parsed correctly (true of grow mode as well).  This happens
because when you switch the short opts to the bitmap_auto version, it
specifies that the argument must follow a, yet the loop expects to get
an undecorated option and parse it as the disk dev instead of trying to
parse optarg.  So, create a new short opt array that is used for manage
and grow that doesn't list a as having an argument.