explicit use of std::vector instead of buffer/Buffer

There were several scoped 'using buffer = std::vector<uint8_t>;' in
header files. This consolidates the code base to use
std::vector<uint8_t> instead of buffer or Buffer. This makes the code
easier to read and debug.

Change-Id: I918a0f6ca9b8e4b9d331175dccff45cbf4c8379d
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/command/sol_cmds.cpp b/command/sol_cmds.cpp
index f475c03..fd9a610 100644
--- a/command/sol_cmds.cpp
+++ b/command/sol_cmds.cpp
@@ -18,7 +18,7 @@
     auto request = reinterpret_cast<const Payload*>(inPayload.data());
     auto solDataSize = inPayload.size() - sizeof(Payload);
 
-    Buffer charData(solDataSize);
+    std::vector<uint8_t> charData(solDataSize);
     if( solDataSize > 0)
     {
         std::copy_n(inPayload.data() + sizeof(Payload),