Resolve Servlet Dependency Clash in Docker Containers

[janothan]

Describe the bug

Error message:

java.lang.NoSuchMethodError:  javax.servlet.ServletContext.createServlet(Ljava/lang/Class;)Ljavax/servlet/Servlet

The existence of two servlet-api dependencies in the docker container may lead to a problem on some machines.

[INFO] +- com.github.dwslab.melt:receiver-http:jar:master-SNAPSHOT:compile
[INFO] |  +- org.eclipse.jetty:jetty-servlet:jar:9.4.34.v20201102:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-security:jar:9.4.34.v20201102:compile
[INFO] |  |     \- org.eclipse.jetty:jetty-server:jar:9.4.34.v20201102:compile
[INFO] |  |        \- javax.servlet:javax.servlet-api:jar:3.1.0:compile
[INFO] |  \- org.eclipse.jetty:jetty-servlets:jar:9.4.34.v20201102:compile
[INFO] \- com.github.dwslab.melt:matching-eval:jar:master-SNAPSHOT:test
[INFO]    \- com.github.dwslab.melt:matching-jena-matchers:jar:master-SNAPSHOT:test
[INFO]       \- org.gradoop.famer:famer-clustering:jar:0.1.0-SNAPSHOT:test
[INFO]          \- org.gradoop:gradoop-flink:jar:0.6.0:test
[INFO]             \- org.apache.flink:flink-shaded-hadoop-2:jar:2.6.5-9.0:test
[INFO]                \- javax.servlet:servlet-api:jar:2.5:test

To Reproduce
There is no known way to reproduce this error since affected containers work on some machines (and do not work on others). For now we could not identify the reason.

Expected behavior
No exception.

Interim Solution
https://dwslab.github.io/melt/faq#evaluation-of-a-docker-based-matcher-javalangnosuchmethoderror-javaxservletservletcontextcreateservlet