## What changes were proposed in this pull request?
In a manually setup federated cluster (not through deployNG) --
Accumulo was installed and when trying to start, below error thrown --
```
2018-08-16 07:33:31,748 [start.Main] ERROR: Thread
'org.apache.accumulo.master.state.SetGoalState' died.
java.lang.IllegalArgumentException: Expected fully qualified URI for
instance.volumes got ns2/apps/accumulo/data
at
org.apache.accumulo.core.volume.VolumeConfiguration.getVolumeUris(VolumeConfiguration.java:107)
at
org.apache.accumulo.server.fs.VolumeManagerImpl.get(VolumeManagerImpl.java:334)
```
Caused by incorrect config value:
`instance.volumes = hdfs://ns1,ns2/apps/accumulo/data`
where ns1 and ns2 are namespaces
Expected is --
`instance.volumes = hdfs://ns1/apps/accumulo/data,hdfs://ns2/apps/accumulo/data`
according to --
https://accumulo.apache.org/docs/2.0/administration/multivolume
## How was this patch tested?
Tested manually
[ Full content available at: https://github.com/apache/ambari/pull/2175 ]
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