Fix channel not shutdown properly issue.

[avikumar15]

After switching some fragments, the logcat prints the following error:

• ~ * ~ * ~ Channel {0} was not shutdown properly!!! ~ * ~ * ~ *
  Make sure to call shutdown()/shutdownNow() and wait until awaitTermination() returns true.
  java.lang.RuntimeException: ManagedChannel allocation site

[Harsh2098]

Something related to Dagger scopes, the channel isn't shared between fragments.

[ranaaditya]

After switching some fragments, the logcat prints the following error:

* ~ * ~ * ~ Channel {0} was not shutdown properly!!! ~ * ~ * ~ *
  Make sure to call shutdown()/shutdownNow() and wait until awaitTermination() returns true.
  java.lang.RuntimeException: ManagedChannel allocation site

We are not maintaining the Channel's lifecycle according to the lifecycle of Fragment/Activity that's why its throwing these errors in logcat !