Added OSGI manifest and switched to spotbugs

Added build of OSGI manifest and switched from findbugs to spotbugs
since former doesn't work with Java 9

Author: castortech

Diff for: pom.xml

@@ -239,6 +239,28 @@
                 </configuration>
             </plugin>
 
+            <plugin>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>  
+                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                    </archive> 
+                </configuration>
+            </plugin>  
+            <plugin>   
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>bundle-manifest</id>
+                        <phase>process-classes</phase>
+                        <goals>    
+                            <goal>manifest</goal>
+                        </goals>   
+                    </execution>
+                </executions>
+            </plugin>
+                 
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
@@ -381,8 +403,9 @@
             <build>
                 <plugins>
                     <plugin>
-                        <groupId>org.codehaus.mojo</groupId>
-                        <artifactId>findbugs-maven-plugin</artifactId>
+                        <groupId>com.github.spotbugs</groupId>
+                        <artifactId>spotbugs-maven-plugin</artifactId>
+                        <version>3.1.0-RC6</version>            
                         <executions>
                             <execution>
                                 <phase>none</phase>