Multi tenancy (#74)

* adding decorators updating the proto span extractor

* adding init commit for haystack collector multi ten

* added tenant configuration

* adding default tenant-id tag as shared in case no defaults found in additional tags configuration

* creating kafka config

* adding plugin configuration

* passing plugin configuration

* loading multiple external decorators

* plugin config is now a list within plugin

* making the single sink dispatch to multiple kafka clusters

* updating kafka record sink for multiple kafka

* fixed tests

* modifying according to new config contract and creating tests

* resolving minor bugs

* adding pluginsloader tests

* removing need to add -Djava.ext.dirs

* tests failing intermittently plausible fix

* trying to fix kafka issues

* adding sample span decorator for user ref and integration testing

* fixing bug closing the kafka producer

* updating version for collector etc

* reverting version bump because of scalactic tripleequals issue

* refactoring and renaming

* updating tests

* deleting submodule haystack-idl

* adding javadoc plugin because staging fails due to missing java doc

haystack-span-decorators/pom.xml

@@ -14,5 +14,11 @@
 
     <build>
         <sourceDirectory>src/main/java</sourceDirectory>
+        <plugins>
+            <plugin>
+                <groupId>net.alchim31.maven</groupId>
+                <artifactId>scala-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
     </build>
 </project>

sample-span-decorator/pom.xml

@@ -24,6 +24,10 @@
         <sourceDirectory>src/main/java</sourceDirectory>
         <finalName>${project.artifactId}</finalName>
         <plugins>
+            <plugin>
+                <groupId>net.alchim31.maven</groupId>
+                <artifactId>scala-maven-plugin</artifactId>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>