Revert "ACCUMULO-1880 create mapreduce module"

This reverts commit 99baad37e86739c701821e3c09d69434236d302a.
Revert "ACCUMULO-2829 Add accumulo-mapreduce.jar to libjars in tool.sh"

This reverts commit 6fbd35d93a1f9861a529a53d0353f5457ad21493.
ACCUMULO-3402 Restore RangeInputSplitTest and remove .gitignore