Add a PerHostRequestQueue object.

Adds a std::map for hostname (or urls) --> PerHostRequestQueue
objects. The latter keeps track of the number of added curl easy
requests and decides if a new request should be throttled or
not, as well as provides the queue to queue throttled requests.

At the moment CurlConcurrentConnectionsPerHost is set to 16,
because things really don't work without LL supporting connection
reuse if we limit it to 2. CurlConcurrentConnectionsPerHost is
also set to non-persistent so that we can easily change it in the future
(once we decide on it's final value it can be set to persistent).

indra/llmessage/CMakeLists.txt

@@ -24,6 +24,7 @@ include_directories(
 set(llmessage_SOURCE_FILES
     aicurl.cpp
     aicurleasyrequeststatemachine.cpp
+    aicurlperhost.cpp
     aicurlthread.cpp
     aihttpheaders.cpp
     aihttptimeoutpolicy.cpp
@@ -113,6 +114,7 @@ set(llmessage_HEADER_FILES
     aicurl.h
     aicurleasyrequeststatemachine.h
     aicurlprivate.h
+    aicurlperhost.h
     aicurlthread.h
     aihttpheaders.h
     aihttptimeoutpolicy.h