Throw exception if exceeds 80w without paging

[zhoney]

resolved: #360

Change-Id: I46c7a61df21d6902aba6c0c965e8f63aa3b76fe2

[codecov]

Codecov Report

Merging #414 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #414      +/-   ##
============================================
- Coverage     70.16%   70.13%   -0.04%     
+ Complexity     3274     3271       -3     
============================================
  Files           208      208              
  Lines         16050    16050              
  Branches       2301     2301              
============================================
- Hits          11262    11256       -6     
- Misses         3536     3543       +7     
+ Partials       1252     1251       -1

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/baidu/hugegraph/task/TaskManager.java	60.86% <0%> (-4.35%)	10% <0%> (-1%)
...e/src/main/java/com/baidu/hugegraph/HugeGraph.java	70.87% <0%> (-0.65%)	60% <0%> (ø)
...va/com/baidu/hugegraph/backend/cache/RamCache.java	67.06% <0%> (-0.41%)	41% <0%> (-1%)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.39% <0%> (-0.16%)	145% <0%> (-1%)
...a/com/baidu/hugegraph/backend/query/Condition.java	62.96% <0%> (+0.52%)	20% <0%> (ø)	⬇️

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[javeme]

add page_limit parameter and set default value as SCAN_PAGE_LIMIT
rename SCAN_PAGE_LIMIT to SCAN_DEFAULT_PAGE_LIMIT

[zhoney]

abandon due to included in #428