Support install to other dir and package to one or multi packages

[laura-ding]

• If you want to install rpm package to other dir

rpm -ivh --prefix=${your_dir} nebula-graph-${version}.rpm

• If you want to package nebula to one package

cd nebula/package
./package.sh -v <version>

• If you want to package nebula to multi packages

cd nebula/package
./package.sh -v <version> -n OFF

fix #1783

[yixinglu]

LGTM

[dutor]

LGTM

[codecov-io]

Codecov Report

Merging #1788 into master will decrease coverage by 0.03%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #1788      +/-   ##
==========================================
- Coverage   86.90%   86.86%   -0.04%     
==========================================
  Files         636      636              
  Lines       59819    59837      +18     
==========================================
- Hits        51984    51979       -5     
- Misses       7835     7858      +23     

Impacted Files	Coverage Δ
src/graph/GoExecutor.cpp	75.81% <0.00%> (+0.36%)	⬆️
src/kvstore/raftex/RaftPart.cpp	76.88% <ø> (-1.06%)	⬇️
src/meta/processors/admin/BalancePlan.h	52.63% <ø> (ø)
src/meta/processors/admin/BalanceProcessor.cpp	0.00% <0.00%> (ø)
src/meta/processors/admin/BalanceTask.h	83.33% <ø> (ø)
src/meta/processors/admin/Balancer.h	75.00% <ø> (ø)
src/storage/admin/AdminProcessor.h	68.61% <38.46%> (-1.68%)	⬇️
src/common/filter/Expressions.cpp	87.44% <52.63%> (-0.25%)	⬇️
src/meta/test/BalancerTest.cpp	97.66% <97.92%> (ø)
src/graph/test/GoTest.cpp	96.80% <100.00%> (ø)
... and 23 more

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