Add a SecureBuffer class

SecureBuffer is like SecureString, but a specialization of
std::vector<uint8_t> that cleans up after itself

Tested: Executed various ipmi commands to see that they still work

Change-Id: Ifd255ef682d6e46d981de6a5a294d12f3666698b
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
9 files changed