Fix for the error during vagrant provision where git command failed to connect with github.com
the error message says:
```
error: while accessing https://github.com/yiisoft/yii.git/info/refs
fatal: HTTP request failed
```
ssh-ing into the box and running ``GIT_CURL_VERBOSE=1 git ls-remote "https://github.com/yiisoft/yii.git"``
shows an SSL error (NSS error -12190).
it turned out that github turned off some SSL/TLS protocols yesterday
(See: https://github.com/blog/2507-weak-cryptographic-standards-removed)
and the Centos 6.7 box used here don't support well the TLSv1.2 protocol that's now mandated by github.
The problem is resolved by force upgrading openssl and curl during provisioning but before call to cookbook yii_framework command
and only for redhat platform. Using "package" Chef command doesn't work, i have to use yum_package and flush the yum repos cache beforehand.