Correct the indent level of the sample codes

The python code examples in ch_ops_customize.xml did not have
a proper indent level and the codes do not work.
Fixes bug #1203622

This commit also changes the following:
- Use <code> instead of <programlisting> for commandline examples
- Remove language="bash" attribute of <programlisting> from
  non-bash examples
- Fix a bug that "Swift only localrc" is split into two parts

Change-Id: Id49a49240d3e5e85d392d1ed24bd688e258c68f7
Merge "Correct the indent level of the sample codes"