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Change-Id: I9f71b5e871671d1d64ad37f78a8944653409b8e1

This allows us to place shared libraries in these containers which may
only be loaded if they are executable.

Change-Id: I78fa9ab6d5c58ec8b98c40004da72aebc0aade2a

Change-Id: I48ee8bd90b47f5845f069cdf4d1b8ba6ecdb1b39
Signed-off-by: San Mehat <san@google.com>

Add an un-encrypted superblock to the end of a secure container to
help identify the crypto cipher used. This is required in order to
provide some semblence of versioning, in case we have cause to
change the crypto type on an update - say for example switching
from software to hardware encryption, or from 128 -> a zillion
bit keys.

NOTE: This format is incompatible with previous secure containers.
After this change they will no longer be mountable.
Signed-off-by: San Mehat <san@google.com>

Signed-off-by: San Mehat <san@google.com>

 - share command was taking wrong arguments
 - shared command was returning two termination codes
 - Force FAT32 cluster size to 4k when formatting
Signed-off-by: San Mehat <san@google.com>

Signed-off-by: San Mehat <san@google.com>

Signed-off-by: San Mehat <san@google.com>

Signed-off-by: San Mehat <san@google.com>

Signed-off-by: San Mehat <san@google.com>