Added replica support#25

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satish-olx wants to merge 8 commits intoadrienmo:masterfrom

satish-olx:use-replica

Commits on Jan 2, 2019

Working on adding replica support
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Commits on Jan 3, 2019

Removed usage of random library; used rand instead
satish-olx
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Removed rand to avoid breaking between different versions of otp; Now using crypto library for generating pseaudo random number
satish-olx
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Use different random library with different otp versions; Removed crypto random
satish-olx
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Commits on Jan 4, 2019

Commits on Jan 7, 2019

Changed filename of utils for better namespacing
satish-olx
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Commits on Jan 8, 2019

Changed data structure in eredis_cluster_monitor state for better performance
satish-olx
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