Fix a bunch of warnings

using the list of warnings from here:
https://github.com/lefticus/cppbestpractices/blob/e73393f25a85f83fed7399d8b65cb117d00b2231/02-Use_the_Tools_Available.md#L100

Seems like a good place to start, and would improve things a bit
type-wise.  This patchset attempts to correct all the issues in one
shot.

Tested:
It builds.  Will test various subsystems that have been touched

Signed-off-by: Ed Tanous <ed.tanous@intel.com>
Change-Id: I588c26440e5a97f718a0f0ea74cc84107d53aa1e
diff --git a/include/image_upload.hpp b/include/image_upload.hpp
index 867d1bc..529e056 100644
--- a/include/image_upload.hpp
+++ b/include/image_upload.hpp
@@ -29,10 +29,10 @@
         return;
     }
     // Make this const static so it survives outside this method
-    static boost::asio::deadline_timer timeout(*req.ioService,
-                                               boost::posix_time::seconds(5));
+    static boost::asio::steady_timer timeout(*req.ioService,
+                                             std::chrono::seconds(5));
 
-    timeout.expires_from_now(boost::posix_time::seconds(15));
+    timeout.expires_after(std::chrono::seconds(15));
 
     auto timeoutHandler = [&res](const boost::system::error_code& ec) {
         fwUpdateMatcher = nullptr;
@@ -76,12 +76,7 @@
                                         "xyz.openbmc_project.Software.Version";
                              }) != interfaces.end())
             {
-                boost::system::error_code ec;
-                timeout.cancel(ec);
-                if (ec)
-                {
-                    BMCWEB_LOG_ERROR << "error canceling timer " << ec;
-                }
+                timeout.cancel();
 
                 std::size_t index = path.str.rfind('/');
                 if (index != std::string::npos)