Fix/cert usage

[Kelfitas]

Proposed changes

Hi there, I tried to use proxify with Chrome and cert was rejected with the following error even tho the CA was installed on the system:

[53853:19971:1214/001611.870452:ERROR:ssl_client_socket_impl.cc(982)] handshake failed; returned -1, SSL error code 1, net_error -207
[53828:64003:1214/001611.988957:ERROR:cert_verify_proc_builtin.cc(670)] CertVerifyProcBuiltin for www.google.com failed:
----- Certificate i=0 (CN=www.google.com,O=Proxify CA,2.5.4.17=#3934313034,2.5.4.9=#353438204D61726B6574205374,L=San Francisco,ST=CA,C=US) -----
ERROR: Target certificate looks like a CA but does not set all CA properties

After some digging, I found this link - https://support.google.com/chrome/thread/184774585?hl=en&msgid=186173470, changed the cert KeyUsage (removed CertSign), tested again with Chrome and it worked!

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[ehsandeep]

@Kelfitas thank you for fixing this one.