making some variables in the FastLeaderElection.java conform to the Camel-Case naming standard

[cyxpdc]

I'm sorry, but I'd like to change the names of these two variables to make them more comfortable.

[cyxpdc]

and logicalclock，maybe “logicalClock”?

[maoling]

@cyxpdc

• Create a JIRA ticket for this.The contributor guideline is [here]
  (https://cwiki.apache.org/confluence/display/ZOOKEEPER/HowToContribute])
• Give this PR a better name? e.g: making some variables in the FastLeaderElection.java conform to the Camel-Case naming standard

[maoling]

@cyxpdc

• lots of annotations in this class mention this outofelection, you can use IDE tool to rename all of them
• Do you have an chance to find all the naming issues in this class:FastLeaderElection to make this patch bigger :)?

[cyxpdc]

@maoling

• A lot. I'm a little busy recently.,maybe I have time later.I'm sorry.

[anmolnar]

It doesn't seem to be a big deal to me, but happy to commit if you could create a Jira for it.

[eolivelli]

I am not sure this change is worth a commit.
And moreover changing variables names can make life harder while porting patches from other branches.

@lvfangmin @hanm

[anmolnar]

And moreover changing variables names can make life harder while porting patches from other branches.

That's a valid concern.