Update version strings to rc2 (tensorflow#22419)

Author: angerson

tensorflow/core/public/version.h

@@ -24,7 +24,7 @@ limitations under the License.
 
 // TF_VERSION_SUFFIX is non-empty for pre-releases (e.g. "-alpha", "-alpha.1",
 // "-beta", "-rc", "-rc.1")
-#define TF_VERSION_SUFFIX "-rc1"
+#define TF_VERSION_SUFFIX "-rc2"
 
 #define TF_STR_HELPER(x) #x
 #define TF_STR(x) TF_STR_HELPER(x)

tensorflow/tools/pip_package/setup.py

@@ -45,7 +45,7 @@
 # This version string is semver compatible, but incompatible with pip.
 # For pip, we will remove all '-' characters from this string, and use the
 # result for pip.
-_VERSION = '1.11.0-rc1'
+_VERSION = '1.11.0-rc2'
 
 REQUIRED_PACKAGES = [
     'absl-py >= 0.1.6',