[yb-ctl] Look at data_dir while stopping cluster

[ndeodhar]

If I have two YB clusters running on the same machine (for example, to test 2DC), then I get this error while stopping any cluster:

16:54 $ ./bin/yb-ctl --data_dir ~/yugabyte-data/ stop
Stopping cluster.
2019-07-05 16:54:41,816 ERROR: When looking for process with daemon id master-1, we found the following running process with data dirs /Users/yugabyte/yugabyte-replica-cluster//node-1/disk-1 but expected data dirs to be /Users/yugabyte/yugabyte-data//node-1/disk-1: 99225 /Users/yugabyte/code/yugabyte/build/latest/bin/yb-master --fs_data_dirs /Users/yugabyte/yugabyte-replica-cluster//node-1/disk-1 --webserver_interface 127.0.0.11 --rpc_bind_addresses 127.0.0.11 --v 0 --version_file_json_path=/Users/yugabyte/code/yugabyte/build/debug-clang-dynamic-enterprise-ninja --callhome_enabled=false --replication_factor=1 --yb_num_shards_per_tserver 2 --master_addresses 127.0.0.11:7100
^^^ Encountered errors ^^^

To fix this, we should also look at data_dir and only stop the processes for the relevant cluster instead of throwing this error.