fix: CPU frequency detection for some containers

[ilyam8]

Summary

Fixes: #12291

This PR adds an additional method of detecting CPU frequency: using "Model name" from lscpu output.

Test Plan

lscpu output

bash-5.1# lscpu
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         46 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  32
  On-line CPU(s) list:   0-31
Vendor ID:               GenuineIntel
  Model name:            Intel(R) Xeon(R) CPU @ 2.00GHz
    CPU family:          6
    Model:               85
    Thread(s) per core:  2
    Core(s) per socket:  16
    Socket(s):           1
    Stepping:            3
    BogoMIPS:            3999.99
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc
                         rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rd
                         rand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx
                          avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves arat md_clear arch_capabilities
Virtualization features:
  Hypervisor vendor:     KVM
  Virtualization type:   full
Caches (sum of all):
  L1d:                   512 KiB (16 instances)
  L1i:                   512 KiB (16 instances)
  L2:                    16 MiB (16 instances)
  L3:                    38.5 MiB (1 instance)
NUMA:
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-31
Vulnerabilities:
  Itlb multihit:         Not affected
  L1tf:                  Mitigation; PTE Inversion
  Mds:                   Mitigation; Clear CPU buffers; SMT Host state unknown
  Meltdown:              Mitigation; PTI
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl and seccomp
  Spectre v1:            Mitigation; usercopy/swapgs barriers and __user pointer sanitization
  Spectre v2:            Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling
  Srbds:                 Not affected
  Tsx async abort:       Mitigation; Clear CPU buffers; SMT Host state unknown

Current:

wget -q -O system-info.sh https://raw.githubusercontent.com/netdata/netdata/master/daemon/system-info.sh; sh system-info.sh | grep -i freq; rm system-info.sh
NETDATA_SYSTEM_CPU_FREQ=0

This PR:

wget -q -O system-info.sh https://raw.githubusercontent.com/ilyam8/netdata/fix_cpu_freq_from_some_containers/daemon/system-info.sh; sh system-info.sh | grep -i freq; rm system-info.sh
NETDATA_SYSTEM_CPU_FREQ=2000000000

Additional Information

[Ferroin]

We may want to consider adding something similar to parse the same type of info from /proc/cpuinfo.

[ilyam8]

@Ferroin that is a good idea!

bash-5.1# grep -m 1 "cpu MHz" /proc/cpuinfo | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | grep -o '^[0-9]*'
1999