Allow rpm to be build as part of package phase

This allows the creation of the RPM artifact as part of the
maven package phase. The result of this is that we get checksum and
name correction for-free as it's all build an installed into the m2
repository. This also publishes the RPM together with .deb to the mvn
mirror.

Note: this will only build the RPM as part of the package phase if
`-Dpackage.rpm=true` since the binaries to build the RPM are not
availabel on all platforms.

core/pom.xml

@@ -1111,6 +1111,31 @@
             </activation>
             <!-- not including license-maven-plugin is sufficent to expose default license -->
         </profile>
+        <profile>
+            <id>package-rpm</id>
+            <activation>
+                <property>
+                    <name>package.rpm</name>
+                    <value>true</value>
+                </property>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.codehaus.mojo</groupId>
+                        <artifactId>rpm-maven-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <id>attach-rpm</id>
+                                <goals>
+                                    <goal>attached-rpm</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
         <profile>
             <id>sign-rpm</id>
             <activation>