Changed scope of CmdWatchSubscriptionChan to local

[KanniShashankh]

it's not global anymore, this might be a noobish implemention tho, i'm open for advice on how to implement it in a better way. Thanks!

Fixes #1000
CmdWatchSubscriptionChan shouldn't be a global variable

[KanniShashankh]

also, i think my linter might be misconfigured or something, the diff shows extra lines touched. :(

[KanniShashankh]

am i missing something here? i'll fix the linter ci run fail but for the integration tests. it fails for even the base branch? is there some config that i'm missing?

This PR does pass getwatch_test.go and zrangewatch_test.go tests.

[JyotinderSingh]

Looks like you may have messed up the merge with master. Usually, you want to:

1. update your local master with the upstream git checkout master && git pull upstream
2. checkout your feature branch `git checkout
3. merge with master git merge master
4. push git push

[JyotinderSingh]

Thanks for this contribution @KanniShashankh! The changes look good overall, have left a few minor comments.