Twitter-oss: Prepare OSS libraries for release

Problem

We want to release the next versions of our Twitter OSS libraries:
 - util -> 6.43.0
 - ostrich -> 9.27.0
 - scrooge -> 4.16.0
 - finagle -> 6.44.0
 - twitter-server -> 1.29.0
 - finatra -> 2.10.0

Solution

Prepare libraries for their next releases.

RB_ID=915023

CHANGES

@@ -6,6 +6,8 @@ Note that ``RB_ID=#`` correspond to associated messages in commits.
 
 Next Version
 
+6.43.0  2017-04-20
+
 Runtime Behavior Changes:
 
   * util-core: `Closable.all(..)` will now catch synchronous exceptions thrown

README.md

@@ -37,7 +37,7 @@ for more details about how to contribute.
 An example SBT dependency string for the `util-collection` tools would look like this:
 
 ```scala
-val collUtils = "com.twitter" %% "util-collection" % "6.42.0"
+val collUtils = "com.twitter" %% "util-collection" % "6.43.0"
 ```
 
 # Units

project/Build.scala

@@ -11,7 +11,7 @@ object Util extends Build {
   val branch = Process("git" :: "rev-parse" :: "--abbrev-ref" :: "HEAD" :: Nil).!!.trim
   val suffix = if (branch == "master") "" else "-SNAPSHOT"
 
-  val libVersion = "6.42.0" + suffix
+  val libVersion = "6.43.0" + suffix
   val zkVersion = "3.5.0-alpha"
   val zkClientVersion = "0.0.81"
   val zkGroupVersion = "0.0.92"