Initial elasticsearch instrumentation (#747)

This commit adds auto-instrumentation for elasticsearch. The
instrumentation has been mostly ported over from OpenTracing
elasticsearch instrumentation.

Co-authored-by: Yusuke Tsutsumi <yusuke@tsutsumi.io>
Co-authored-by: alrex <aboten@lightstep.com>

scripts/eachdist.py

@@ -450,6 +450,7 @@ def install_args(args):
         allfmt += "[{}]".format(",".join(extras))
     # note the trailing single quote, to close the quote opened above.
     allfmt += "'"
+
     execute_args(
         parse_subargs(
             args,