add different body check method:
1. complete body: body: content-20-123456789
2. regex compare: body: r'123'
3. filecompare: "file(filename=checkbody.txt)"
4. user script: sh: script.sh xxxx $real_response

this has for example case in example/
add clientscript.py for example case
Merge pull request #4 from sifeier/master

body check support userscript regex file(filename)  4 method