Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57344
Provide sha1 checksum files for Tomcat downloads.
Exclude stray *.asc file from apache-tomcat-*-embed.tar.gz archive.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1645357 13f79535-47bb-0310-9956-ffa450edef68