Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer core and image format patches

# gpg: Signature made Fri May 22 16:21:03 2015 BST using RSA key ID C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"

* remotes/kevin/tags/for-upstream: (22 commits)
  MAINTAINERS: Split "Block QAPI, monitor, command line" off core
  MAINTAINERS: Add header files to Block Layer Core section
  tests: add test case for encrypted qcow2 read/write
  qemu-io: prompt for encryption keys when required
  util: allow \n to terminate password input
  util: move read_password method out of qemu-img into osdep/oslib
  qcow2/qcow: protect against uninitialized encryption key
  qemu-iotests: Make debugging python tests easier
  qemu-iotests: qemu-img info on afl VMDK image with a huge capacity
  block: Detect multiplication overflow in bdrv_getlength
  qemu-io: Use getopt() correctly
  qcow2: style fixes in qcow2-cache.c
  qcow2: make qcow2_cache_put() a void function
  qcow2: use a hash to look for entries in the L2 cache
  qcow2: remove qcow2_cache_find_entry_to_replace()
  qcow2: use an LRU algorithm to replace entries from the L2 cache
  qcow2: simplify qcow2_cache_put() and qcow2_cache_entry_mark_dirty()
  qcow2: use one single memory block for the L2/refcount cache tables
  vmdk: Fix overflow if l1_size is 0x20000000
  vmdk: Fix next_cluster_sector for compressed write
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>