DockerFetcherPluginTest.INTERNET_CURL_FetchManifest is flaky

[ RUN      ] DockerFetcherPluginTest.INTERNET_CURL_FetchManifest
E0315 17:28:59.233052 25940 shell.hpp:106] Command 'hadoop version 2>&1' failed; this is the output:
sh: 1: hadoop: not found
E0315 17:28:59.233104 25940 fetcher.cpp:59] Failed to create URI fetcher plugin 'hadoop': Failed to create HDFS client: Failed to execute 'hadoop version 2>&1'; the command was either not found or exited with a non-zero exit status: 127
../../src/tests/uri_fetcher_tests.cpp:230: Failure
Failed to wait 1mins for fetcher.get()->fetch(uri, dir)