Fix sibling cross-chain transfer, enable all orml-xtokens unit tests

[shaunxw]

No description provided.

[codecov-commenter]

Codecov Report

Merging #558 (c51cfaa) into master (8b11c6e) will increase coverage by 0.81%.
The diff coverage is 94.23%.

@@            Coverage Diff             @@
##           master     #558      +/-   ##
==========================================
+ Coverage   71.60%   72.42%   +0.81%     
==========================================
  Files          76       76              
  Lines        5289     5388      +99     
==========================================
+ Hits         3787     3902     +115     
+ Misses       1502     1486      -16     

Impacted Files	Coverage Δ
xtokens/src/mock/para.rs	61.29% <64.70%> (+1.29%)	⬆️
xtokens/src/lib.rs	65.74% <100.00%> (+5.55%)	⬆️
xtokens/src/mock/mod.rs	90.69% <100.00%> (+19.96%)	⬆️
xtokens/src/tests.rs	100.00% <100.00%> (ø)
xtokens/src/mock/relay.rs	100.00% <0.00%> (+25.00%)	⬆️
xcm-support/src/currency_adapter.rs	80.95% <0.00%> (+33.33%)	⬆️

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