Feat/cluster client

[iGxnon]

Base on #464

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov]

Codecov Report

Attention: 103 lines in your changes are missing coverage. Please review.

Comparison is base (e726fa8) 53.46% compared to head (87f35d8) 53.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
- Coverage   53.46%   53.18%   -0.28%     
==========================================
  Files         103      104       +1     
  Lines       17712    17812     +100     
  Branches    17712    17812     +100     
==========================================
+ Hits         9469     9474       +5     
- Misses       7674     7771      +97     
+ Partials      569      567       -2     

Files	Coverage Δ
xlineapi/src/lib.rs	71.69% <ø> (ø)
xline-client/src/lib.rs	0.73% <0.00%> (ø)
xline-client/src/clients/cluster.rs	0.00% <0.00%> (ø)
xline-client/src/types/cluster.rs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[Phoenix500526]

LGTM