Relax a bit tomcat detection (#2459)

There might be some trailing text after "Apache-Coyote",
like on <https://espace-client.sfr.fr/services-web/>

Also, the 4.1+ thingy is useless, often confusing,
sometimes wrong, and is a bit irrelevant in 2018 since
Tomcat 4.1 was declared stable in 2002,
with its last release in 2009.