For example, the line, "if [[ -n $no_proxy ]]; then" is misparsed
as the beginning of metasection because get_meta_section() misses
escaping of "|" unlike get_meta_section_files().
This patch adds necessary escape as "|" -> "\|".
Change-Id: Ic14b2ac167037c4f5db89492f0e8a4c5b13c7b6d
Closes-Bug: #1262960