SCOS: Compute-pcrs is unable to find the ESP tree due to the vendor name

[bgartzi]

compute-pcrs/lib/src/esp.rs

Line 17 in 4c77196

const ESP_VENDOR_NAMES: [&str; 2] = ["redhat", "fedora"];

does not include centos as a possible option.

The glob approach proposed by #61, although coming from an unrelated issue, fixes it. And it seems a better fit to fix this issue than adding "centos" to the viable list of vendors, it would imply adding a new value each time a new distro/vendor is considered.

cc: @fangge1212

[bgartzi]

This should have been fixed by #61, although there are not tests that cover that scenario.