Update the list of root certificates in src/node_root_certs.h with
tools/mk-ca-bundle.pl.

Certificates added:
- GDCA TrustAUTH R5 ROOT
- SSL.com EV Root Certification Authority ECC
- SSL.com EV Root Certification Authority RSA R2
- SSL.com Root Certification Authority ECC
- SSL.com Root Certification Authority RSA
- TrustCor ECA-1
- TrustCor RootCert CA-1
- TrustCor RootCert CA-2

Certificates removed:
- ACEDICOM Root
- AddTrust Low-Value Services Root
- AddTrust Public Services Root
- AddTrust ualified Certificates Root
- CA Disig Root R1
- Camerfirma Chambers of Commerce Root
- Camerfirma Global Chambersign Root
- CA WoSign ECC Root
- Certification Authority of WoSign G2
- Certinomis - Autorité Racine
- Certum Root CA
- China Internet Network Information Center EV Certificates Root
- CNNIC ROOT
- Comodo Secure Services root
- Comodo Trusted Services root
- DST ACES CA X6
- GeoTrust Global CA 2
- PSCProcert
- Security Communication EV RootCA1
- StartCom Certification Authority
- StartCom Certification Authority
- StartCom Certification Authority G2
- Swisscom Root CA 1
- Swisscom Root CA 2
- Swisscom Root EV CA 2
- TUBITAK UEKAE Kok Sertifika Hizmet Saglayicisi - Surum 3
- TURKTRUST Certificate Services Provider Root 2007
- UTN USERFirst Hardware Root CA
- WoSign
- WoSign China

Backport-PR-URL: nodejs#19634
PR-URL: nodejs#19322
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Remove the CNNIC certificates again and remove the whitelist from commit
3beb880 ("crypto: add cert check to CNNIC Whitelist") from June 2015.

Backport-PR-URL: nodejs#19634
PR-URL: nodejs#19322
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Uses fs.access to implement fs.exists functionality. Fixes a issue,
when a file exists but user does not have privileges to do stat on the
file.

Fixes: nodejs#17921

PR-URL: nodejs#18618
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: James M Snell <jasnell@gmail.com>