Add missed file rename for ssl_crtd.cc

diff --git a/src/security/cert_generators/file/ssl_crtd.cc b/src/security/cert_generators/file/security_file_certgen.cc
similarity index 100%
rename from src/security/cert_generators/file/ssl_crtd.cc
rename to src/security/cert_generators/file/security_file_certgen.cc