speedtest: to_string, stoi, fix tests.

Some platform toolchains support a c++11 Draft
which lacked std::to_string and std::stoi.

Fix options_test FullLong_Valid, there is a default
hostname now not empty.

RequestTest cannot set a const Url, needs to use set_url.

request_test was including request.o twice, leading to linker
errors about duplicate definitions. Create a libspeedtesttest.a
and let the linker figure it out.

Change-Id: Ibbdad36cbd561583673feeb5ed87f7b59558762d
9 files changed