Watcher: fix NODE_NAME if missing #2824
Merged
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The pkg/reader/node package gets the value of the NODE_NAME environment variable (if the HUBBLE_NODE_NAME is empty). If it is empty, it gets the hostname and uses that. The pkg/watcher package just attempts to get the NODE_NAME environment variable and warns that it will not work as expected if it is empty or missing. This commit changes pkg/watcher so that it uses pkg/reader/node's function instead.