compatible with h2 storage

[dmsolr]

// Describe your PR here; eg. Fixes #issueNo

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1. compatible with h2
2. change default storage to H2

[dengliming]

Let's separate multiple database configurations for now.

[codecov-io]

Codecov Report

Merging #918 (8f8f18c) into master (24d421f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #918   +/-   ##
=========================================
  Coverage     76.60%   76.60%           
  Complexity     2037     2037           
=========================================
  Files           331      331           
  Lines          7507     7507           
  Branches        832      832           
=========================================
  Hits           5751     5751           
  Misses         1316     1316           
  Partials        440      440           

Impacted Files	Coverage Δ	Complexity Δ
...soul/admin/service/init/LocalDataSourceLoader.java	100.00% <100.00%> (ø)	6.00 <0.00> (ø)

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