My final solution to this problem:

DON'T DISABLE /etc/init.d/cryptdisks-early !

1. DEACTIVATE AUTOMATIC MOUNTING OF CRYPTSWAP1:

Modify /etc/fstab changing the line:

/dev/mapper/cryptswap1 none swap sw 0 0

to

/dev/mapper/cryptswap1 none swap noauto,sw 0 0

and modify /etc/crypttab changing the line from:

cryptswap1 UUID=01234567-89ab-cdef-0123-456789abcdef /dev/urandom
swap,cipher=aes-cbc-essiv:sha256

to

cryptswap1 UUID=01234567-89ab-cdef-0123-456789abcdef /dev/urandom
noauto,offset=6,swap,cipher=aes-cbc-essiv:sha256

Don't forget to replace my sample UUID with the correct for your system.
On my system offset=6 was sufficient, because cryptsetup already skips
the two first sectors of the swap partition.

2. REBUILD YOUR SWAP PARTITION

CAUTION: you must replace /dev/sdaX with the correct swap partition for
your system!

sudo mkswap --label Ubuntu\ Swap --uuid 01234567-89ab-
cdef-0123-456789abcdef /dev/sdaX

Don't forget to replace my sample UUID with the correct for your system.
The label is optional (I like swap partition labels :D)

3. CREATE AN UPSTART SCRIPT ( /etc/init/cryptswap1.conf )

start on started mountall
script
        /sbin/cryptdisks_start cryptswap1
        /sbin/swapon /dev/mapper/cryptswap1
end script

4. REBOOT AND VERIFY YOUR SYSTEM

$ free --human

             total       used       free     shared    buffers     cached
Mem:          15.7G ...
-/+ buffers/cache: ...
Swap:         16.0G ...

$ swapon --summary
Filename                                Type            Size    Used    Priority
/dev/mapper/cryptswap1 ...

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https://bugs.launchpad.net/bugs/1310058

Title:
  ecryptfs-setup-swap hints after reboot

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