Use https for all downloads.

Use https instead of http for all downloads within the install
script. In cases where the links refer to artifacts in our s3 bucket,
switch to https + s3.amazon.aws.com, which is already used by other urls
in the script.

This fixes falcosecurity/falco#152.

scripts/install-sysdig.in

@@ -27,18 +27,18 @@ function install_rpm {
 	if ! yum -q list dkms > /dev/null 2>&1; then
 		echo "* Installing EPEL repository (for DKMS)"
 		if [ $VERSION -eq 7 ] && [ $DISTRO = "centos" ]; then
-			rpm --quiet -i http://mirrors.kernel.org/centos/7/extras/x86_64/Packages/epel-release-7-5.noarch.rpm
+			rpm --quiet -i https://mirrors.kernel.org/centos/7/extras/x86_64/Packages/epel-release-7-5.noarch.rpm
 		elif [ $VERSION -eq 7 ]; then
-			rpm --quiet -i http://mirrors.kernel.org/fedora-epel/7/x86_64/e/epel-release-7-8.noarch.rpm
+			rpm --quiet -i https://mirrors.kernel.org/fedora-epel/7/x86_64/e/epel-release-7-8.noarch.rpm
 		else
-			rpm --quiet -i http://mirrors.kernel.org/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
+			rpm --quiet -i https://mirrors.kernel.org/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
 		fi
 	fi
 
 	echo "* Installing _COMPONENT_ public key"
 	rpm --quiet --import https://s3.amazonaws.com/download.draios.com/DRAIOS-GPG-KEY.public
 	echo "* Installing _COMPONENT_ repository"
-	curl -s -o /etc/yum.repos.d/draios.repo http://download.draios.com/_REPOSITORY_NAME_/rpm/draios.repo
+	curl -s -o /etc/yum.repos.d/draios.repo https://s3.amazonaws.com/download.draios.com/_REPOSITORY_NAME_/rpm/draios.repo
 	echo "* Installing kernel headers"
 	KERNEL_VERSION=$(uname -r)
 	if [[ $KERNEL_VERSION == *PAE* ]]; then
@@ -66,7 +66,7 @@ function install_deb {
 	echo "* Installing Sysdig public key"
 	curl -s https://s3.amazonaws.com/download.draios.com/DRAIOS-GPG-KEY.public | apt-key add -
 	echo "* Installing _COMPONENT_ repository"
-	curl -s -o /etc/apt/sources.list.d/draios.list http://download.draios.com/_REPOSITORY_NAME_/deb/draios.list
+	curl -s -o /etc/apt/sources.list.d/draios.list https://s3.amazonaws.com/download.draios.com/_REPOSITORY_NAME_/deb/draios.list
 	apt-get -qq update < /dev/null
 	echo "* Installing kernel headers"
 	apt-get -qq -y install linux-headers-$(uname -r) < /dev/null || kernel_warning