[finagle]: Portable shebang

Problem:

/bin/bash is not available on non-FHS distros, such as NixOS

Solution:

Replace /bin/bash with /usr/bin/env bash

Result:

Closes #959

Differential Revision: https://phabricator.twitter.biz/D1107565

doc/src/sphinx/code/client-server-anatomy/sbt

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 sbtver=1.3.10
 sbtjar=sbt-launch.jar

doc/src/sphinx/code/protocols/sbt

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 sbtver=1.3.10
 sbtjar=sbt-launch.jar

doc/src/sphinx/code/quickstart/sbt

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 sbtver=1.3.10
 sbtjar=sbt-launch.jar

finagle-benchmark/src/main/scripts/load_balancing_numbers.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ./sbt 'project finagle-benchmark' \
       'run-main com.twitter.finagle.loadbalancer.Simulation -dur=60.seconds -bal=rr -qps=1000 -showprogress=false -showsummary=false -coldstart=false' 2>&1 |gawk 'match($0, /BinaryAnnotation\(balancer,([0-9]+).*\)/, a){print a[1]}' > all_good_1000_rr.txt

link-netty.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if [ $# -ne 1 ]; then
   echo 'usage: '$0' nettyjarpath' 1>&2

netty-snapshot-env.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 print_env () {
   echo "FINAGLE_USE_NETTY_4_SNAPSHOT=$FINAGLE_USE_NETTY_4_SNAPSHOT"

pushsite.bash

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

sbt

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -eo pipefail