Fedora workaround for bz741655

After unlocking a crypto device, give LVM a chance to assemble a VG from it.
Needed to make the crypto-on-lvm-on-crypto disk layout work.

Non-upstream patch. Will be obsoleted as soon as LVM gets the planned
'policy daemon which will activate LV according to some system policy'.

Index: systemd-36/src/cryptsetup-generator.c
===================================================================
--- systemd-36.orig/src/cryptsetup-generator.c
+++ systemd-36/src/cryptsetup-generator.c
@@ -132,8 +132,10 @@ static int create_disk(
                 "RemainAfterExit=yes\n"
                 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
                 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
+                "ExecStartPost=/lib/systemd/fedora-crypto-lvm-hack '/dev/mapper/%s'\n"
                 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
                 name, u, strempty(password), strempty(options),
+                name,
                 name);
 
         if (has_option(options, "tmp"))