KUDU-379: fix LESS_EQUAL predicates on bool, float and double columns
KUDU-379: fix LESS_EQUAL predicates on bool, float and double columns

This commit adds missing implementation of IncrementCell for bool, float and
double columns, which fixes a TS crash when scanning with an inclusive
upper-bound predicate on these column types. A follow up commit will add tests
for predicates on all column types.

Change-Id: I46cc354b70effba51037f640358f4df5d1fc6657
Reviewed-on: http://gerrit.cloudera.org:8080/2647
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>

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