Rename file.contains_regex to file.contains_regex_multiline
Remove lchar from file.contains_regex_multiline
Add file.contains_regex (operates on single lines)
Replace file.contains_regex with multiline version (keep same behavior)
Use salt.utils.fopen instead of open
Merge pull request #4208 from basepi/fileregex

Rename file.contains_regex to file.contains_regex_multiline.