Make relocate dependencies script less manual

Patch by Alex Petrov; reviewed by Ekaterina Dimitrova and David Capwell for CASSANDRA-16287

build-shaded-dtest-jar.sh

@@ -2,12 +2,14 @@
 
 set -xe
 
-# Cassandra version that is specified in build.xml
-CASSANDRA_VERSION=$1
-# In-JVM dtest version that is specified in relocate-dependencies.pom
-DTEST_VERSION=$2
 ARTIFACT_NAME=cassandra-dtest
 REPO_DIR=~/.m2/repository
+CASSANDRA_VERSION=$(cat build.xml | grep 'property name="base.version"' | awk -F "\"" '{print $4}')
+DTEST_VERSION=$(cat relocate-dependencies.pom | grep "dtest-local.version>" | awk -F "\>|\<" '{print $3}')
+SHADED_DTEST_VERSION=$(cat relocate-dependencies.pom | grep -m 1 "<version>" | awk -F "\>|\<" '{print $3}')
+
+echo $CASSANDRA_VERSION
+echo $DTEST_VERSION
 
 ant clean
 ant dtest-jar
@@ -27,7 +29,7 @@ mvn -f relocate-dependencies.pom package -DskipTests -nsu
 
 # Deploy shaded artifact
 mvn install:install-file                 \
-   -Dfile=./target/${ARTIFACT_NAME}-shaded-${DTEST_VERSION}.jar \
+   -Dfile=./target/${ARTIFACT_NAME}-shaded-${SHADED_DTEST_VERSION}.jar \
    -DgroupId=org.apache.cassandra        \
    -DartifactId=${ARTIFACT_NAME}-shaded  \
    -Dversion=${DTEST_VERSION}            \

relocate-dependencies.pom

@@ -19,6 +19,7 @@
         <junit.version>4.12</junit.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
+        <dtest-local.version>4.0.0-SNAPSHOT</dtest-local.version>
     </properties>
 
     <dependencies>
@@ -26,7 +27,7 @@
         <dependency>
             <groupId>org.apache.cassandra</groupId>
             <artifactId>cassandra-dtest-local</artifactId>
-            <version>4.0.0-SNAPSHOT</version>
+            <version>${dtest-local.version}</version>
         </dependency>
 
         <dependency>