Provision environment variables for SSL autotests

Task-number: QTBUG-56102
Change-Id: I7f14fbebcc459b4610ca9469b4335ef5b18ba5b4
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

coin/provisioning/qtci-macos-10.12-x86_64/007-SSL_keychain.sh

+#!/bin/sh
+# Enables the usage of temporary keychains for SSL autotests
+echo "export QT_SSL_USE_TEMPORARY_KEYCHAIN=1" >> ~/.bashrc

coin/provisioning/qtci-osx-10.11-x86_64/007-SSL_keychain.sh

+#!/bin/sh
+# Enables the usage of temporary keychains for SSL autotests
+echo "export QT_SSL_USE_TEMPORARY_KEYCHAIN=1" >> ~/.bashrc