Add #!/bin/bash to /etc/rc.local

Lack of shell designation in script results in a degraded systemctl
state on Xenial.  Make this change to all element instances for
code maintenance purposes.

Change-Id: I7bcbd4bdd1623a18d1cb01a83aa7bd5a76883f7f

integration/scripts/files/elements/fedora-mongodb/install.d/10-mongodb

@@ -7,6 +7,8 @@ set -e
 set -o xtrace
 
 cat > "/etc/rc.local" << _EOF_
+#!/bin/bash
+
 # Make sure to disable Linux kernel feature transparent huge pages,
 # it will affect greatly both memory usage and latency in a negative way.
 # See: http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/

integration/scripts/files/elements/fedora-postgresql/install.d/10-postgresql

@@ -14,6 +14,8 @@ vm.overcommit_memory=0
 _EOF_
 
 cat > "/etc/rc.local" << _EOF_
+#!/bin/bash
+
 # See 'http://www.postgresql.org/docs/9.3/static/kernel-resources.html'
 # Disable Linux kernel transparent huge pages. This feature is not supported by
 # by Postgres 9.3 and may negatively impact performance of the database.

integration/scripts/files/elements/ubuntu-postgresql/install.d/30-postgresql

@@ -17,6 +17,8 @@ vm.nr_hugepages=64
 _EOF_
 
 cat > "/etc/rc.local" << _EOF_
+#!/bin/bash
+
 # See 'http://www.postgresql.org/docs/9.4/static/kernel-resources.html'
 # Postgres 9.4 added support for THP. Using huge pages reduces overhead when
 # using large contiguous chunks of memory, like PostgreSQL does.

integration/scripts/files/elements/ubuntu-redis/install.d/30-redis

@@ -21,6 +21,8 @@ net.core.somaxconn=1024
 _EOF_
 
 cat > "/etc/rc.local" << _EOF_
+#!/bin/bash
+
 # Make sure to disable Linux kernel feature transparent huge pages,
 # it will affect greatly both memory usage and latency in a negative way.
 if test -f /sys/kernel/mm/transparent_hugepage/defrag; then

integration/scripts/files/elements/ubuntu-vertica/install.d/97-vertica

@@ -41,6 +41,8 @@ TMPDIR=/tmp JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64 make
 cd
 
 cat > "/etc/rc.local" << _EOF_
+#!/bin/bash
+
 # Vertica requires THP to be turned off
 if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag