Fix generation of paths in dev.bundles file in multiple bundles environment

bundle:/opt/nuxeo-server-9.10-tomcat-sdk/nxserver/dev-bundles/hotreload-bundle-1516842407094.jarbundle:/opt/nuxeo-server-9.10-tomcat-sdk/nxserver/dev-bundles/hotreload-bundle-1516842407193.jar## GENERATOR-NUXEO STUFF - DO NOT EDIT
bundle:/opt/projects/workflow_code/workflow-code-core/target/classes
bundle:/opt/projects/workflow_code/workflow-code-api/target/classes
## GENERATOR-NUXEO STUFF - END

Caused by: java.io.FileNotFoundException: /opt/nuxeo-server-9.10-tomcat-sdk/nxserver/dev-bundles/hotreload-bundle-1516842407094.jarbundle:/opt/nuxeo-server-9.10-tomcat-sdk/nxserver/dev-bundles/hotreload-bundle-1516842407193.jar## GENERATOR-NUXEO STUFF - DO NOT EDIT (No such file or directory)
	at java.util.zip.ZipFile.open(Native Method)
	at java.util.zip.ZipFile.<init>(ZipFile.java:225)
	at java.util.zip.ZipFile.<init>(ZipFile.java:155)
	at java.util.jar.JarFile.<init>(JarFile.java:166)
	at java.util.jar.JarFile.<init>(JarFile.java:130)
	at org.nuxeo.osgi.JarBundleFile.<init>(JarBundleFile.java:57)
	at org.nuxeo.osgi.OSGiBundleContext.installBundle(OSGiBundleContext.java:134)
	... 14 more