hazelcast-network.xml is not included in support zip

As of changes since 3.7.0 per NEXUS-14377, Nexus uses the following logic to load hazelcast config files:

• if $karaf.data/etc/fabric/hazelcast-network.xml does not exist, copy $karaf.base/etc/fabric/hazelcast-network-default.xml to $karaf.data/etc/fabric/hazelcast-network.xml
• if $karaf.base/etc/fabric/hazelcast.xml exists, load it
• if $karaf.base/etc/fabric/hazelcast.xml does not exist, log a WARN and load default values from internal configuration

The problem is the support zip generator does not include $karaf.data/etc/fabric/hazelcast-network.xml and therefore by default it is impossible to learn what the user has configured hazelcast to do.

https://github.com/sonatype/nexus-internal/blob/f8d90379daff553edf6bcb8e8f983a794ccde6f6/private/plugins/nexus-hazelcast-plugin/src/main/java/com/sonatype/nexus/hazelcast/internal/HazelcastInstanceProvider.java#L128

The other "fabric" install dir files are included and sanitized.

Expected

• bundle $karaf.data/etc/fabric/hazelcast-network.xml into the support zip at path work/etc/fabric/hazelcast-network.xml
• obfuscate any potential passwords that may be in that file