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ARROW-4802: [Python] Follow symlinks when deriving Hadoop classpath for HDFS

If HADOOP_HOME is a symlink, the '-L' option needs to be passed to the find command

Author: tigerchen <chenfj068@gmail.com>
Author: tiger <tiger@tigerdeMacBook-Pro.local>
Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #3983 from chenfj068/master and squashes the following commits:

03c505fad <tiger> ARROW-4802:  Hadoop classpath discovery broken HADOOP_HOME is a symlink
919ed5a1f <tiger> Merge remote-tracking branch 'upstream/master'
1077cf457 <tigerchen> Merge remote-tracking branch 'upstream/master'
9ff5ca619 <Krisztián Szűcs> don't install libhdfs3
4a65baf66 <tigerchen> ARROW-4820: hadoop class path derived not correct