feat: add TLS certificate reloading on SIGHUP #27057
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Add TLS certificate reloading on SIGHUP. For httpd service certificates, the configuration is reloaded and certificate and key file locations are updated accordingly. For opentsdb service certificates, certificates and keys at the existing locations are reloaded. If reloading a certificate fails, the currently loaded certificate continues to be used. Also adds file permission checking for TLS certificates and private keys. Clean cherry-pick of #26994 to 1.12. Closes: #27056 (cherry picked from commit 8c9b850)
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Add TLS certificate reloading on SIGHUP. For httpd service certificates, the configuration is reloaded and certificate and key file locations are updated accordingly. For opentsdb service certificates, certificates and keys at the existing locations are reloaded. If reloading a certificate fails, the currently loaded certificate continues to be used.
Also adds file permission checking for TLS certificates and private keys.
Clean cherry-pick of #26994 to 1.12.
Closes: #27056
(cherry picked from commit 8c9b850)