v2.0: About a year and a half ago, we delivered this automated installer w…

…hich can install open-source ranger, as emr-native ranger feature release, we deeply refactored it, combined open-source and emr-native ranger together, make it support 4 high applicability scenarios ( No.1, 2, 3, 4) altogether. for this commit, Scenario 1: "OpenLDAP + EMR-Native Ranger" is fully tested, works very well.

v1.0

Merge remote-tracking branch 'origin/master'