API for CA path verfication and it's relative

[dlmeetei]

API for adding and loading CA file path need to added to evt.
Until this API comes up, we should use

/*Gives the ptr to SSL_CTX usable raw openSSL programming */
SSL_CTX *evt_get_SSL_CTX(const evt_ctx_t *ctx);

/*Gives the ssl usable for doing raw OpenSSL programming */
SSL *evt_get_ssl(const evt_tls_t *tls);