Reduce size of zvol and enforce 4k blocksize in zvol tests

32-bit builders in the buildbot are having trouble completing
their ENOSPC testing in less than the timeout. Reduce the
zvol size and use a 4k block size to reduce read-modify-writes
which are particularly expensive on 32-bit systems due to the
reduced maximum ARC size.

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Kash Pande <[email protected]>
Signed-off-by: Giuseppe Di Natale <[email protected]>
Closes #5845 

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