disable certificate check for HTTPS installation repository...

...when sslcerts=0 boot option is used (bnc#807799)

- 2.17.100
Merge branch 'Code-11-SP3' into disable_ca_check

Conflicts:
	VERSION
	package/yast2-packager.changes
expand tabs
use tolower() for case insensitive check
move SSL check to a seprate function
read "ssl_verify" option from install.inf
updated .gitignore
Merge pull request #9 from yast/disable_ca_check

Disable certificate check for HTTPS installation repository...