Add support for ppc64le

[amitsadaphule]

Validated using redis-server binary extracted from
the following rpm and copying it to resources dir
with name redis-server-3.2.8-ppc64le:
https://cbs.centos.org/kojifiles/packages/redis/3.2.8/1.el7/ppc64le/redis-3.2.8-1.el7.ppc64le.rpm

Note: the binary is not part of the commit. It can be added to the repo with the following steps:
mkdir redis_rpm; cd redis_rpm
wget https://cbs.centos.org/kojifiles/packages/redis/3.2.8/1.el7/ppc64le/redis-3.2.8-1.el7.ppc64le.rpm
rpm2cpio redis-3.2.8-1.el7.ppc64le.rpm | cpio -idm
cd ..; git clone https://github.com/kstyrc/embedded-redis.git
cp redis_rpm/usr/bin/redis-server embedded-redis/src/main/resources/redis-server-3.2.8-ppc64le

Fixes #71

[amitsadaphule]

@kstyrc @turu please provide your feedback! If you'd like, I can setup a travis job to extract the redis rpm and add the bins to github releases like https://github.com/amitsadaphule/HDP-ppc64le-bin-factory/releases/tag/hadoop2.7.3.x.

[gerrith3]

@kstyrc or @turu is there any update on this? We'd like to be able to enable this for ppc64le asap with key customers waiting on confirmation that we are moving the right direction. Thanks!