The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.
Hence, fixing them all now might curb this practice from now on.
Closes#12028
This way, we always have exactly one slash after the host name, making
the tests pass when curl is compiled with the MSYS GCC.
Closes https://github.com/curl/curl/pull/4512