CLSA-2024-1723809128 Fix of 39 CVEs

CVE-url: https://ubuntu.com/security/CVE-2024-36939 - NFS: Cleanup - add nfsclientsexit to mirror nfsclientsinit - nfs: expose /proc/net/sunrpc/nfs in net namespaces - sunrpc: add a struct rpcstats arg to rpccreateargs - nfs: make the rpcstat per net namespace - nfs: Handle error of rpcprocregist...