switch to raw strings for regexp stings

[frispete]

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[frispete]

Anything wrong with this request?

Running current osc on tumbleweed, each and every invocation results in:

> osc build
/usr/lib/osc-plugins/osc-collab.py:2392: SyntaxWarning: invalid escape sequence '\S'
  re_spec_header_with_version = re.compile('^(# spec file for package \S*) \(Version \S*\)(.*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2393: SyntaxWarning: invalid escape sequence '\s'
  re_spec_define = re.compile('^%define\s+(\S*)\s+(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2394: SyntaxWarning: invalid escape sequence '\s'
  re_spec_name = re.compile('^Name:\s*(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2395: SyntaxWarning: invalid escape sequence '\s'
  re_spec_version = re.compile('^(Version:\s*)(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2396: SyntaxWarning: invalid escape sequence '\s'
  re_spec_release = re.compile('^(Release:\s*)\S*', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2397: SyntaxWarning: invalid escape sequence '\s'
  re_spec_source = re.compile('^(Source0?:\s*)(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2392: SyntaxWarning: invalid escape sequence '\S'
  re_spec_header_with_version = re.compile('^(# spec file for package \S*) \(Version \S*\)(.*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2393: SyntaxWarning: invalid escape sequence '\s'
  re_spec_define = re.compile('^%define\s+(\S*)\s+(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2394: SyntaxWarning: invalid escape sequence '\s'
  re_spec_name = re.compile('^Name:\s*(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2395: SyntaxWarning: invalid escape sequence '\s'
  re_spec_version = re.compile('^(Version:\s*)(\S*)', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2396: SyntaxWarning: invalid escape sequence '\s'
  re_spec_release = re.compile('^(Release:\s*)\S*', re.IGNORECASE)
/usr/lib/osc-plugins/osc-collab.py:2397: SyntaxWarning: invalid escape sequence '\s'
  re_spec_source = re.compile('^(Source0?:\s*)(\S*)', re.IGNORECASE)
Building tupitube.spec for openSUSE_Factory/x86_64
Running source_service 'format_spec_file' ...
Running source_service 'source_validator' ...
[...]