Remove unused certs from client.

src/certs/AddTrust_External_Root.pem

src/certs/QuoVadisEVSSLICAG3.crt

src/certs/QuoVadisGlobalSSLICAG2.crt

src/certs/QuoVadisGlobalSSLICAG3.crt

src/certs/QuoVadis_Root_CA_2.pem

src/certs/QuoVadis_Root_CA_2_G3.pem

src/certs/README

src/certs/TERENASSLCA.crt

src/certs/TERENASSLCA2.crt

src/certs/USERTrustRSAAddTrustCA.crt

src/certs/UTNAddTrustServer_CA.crt