Switch from keychain to ssh-add

Since we are starting the agent manually, keychain does not seem to be
adding any value. It was also throwing some errors.

.bashrc

@@ -42,7 +42,7 @@ if [[ "${OSTYPE}" == "linux-gnu"* ]]; then
     fi
 
     for key in $(find "${HOME}/.ssh" -type f -name "*.pub"); do
-        keychain --nogui --quiet "${key%.*}"
+        ssh-add -q "${key%.*}"
     done
 
 #    bind -x '"\C-r"':reset