[Tizen] Check signature value using xmlsec1 library

Based on API provided by xmlsec1 library, signature value and reference
are checked.
Using xwalk/tools/lint.py,  it require two space. Otherwise it will report error as below:
application/common/installer/tizen/signature_xmlsec_adaptor.cc:323:  At least two spaces is best between code and comments  [whitespace/comments] [2]