Extend support for WSL and Docker apps

[davidpanderson]

• New philosophy: always query the presence of software (WSL distros, Docker) even if client config doesn't allow its use. Send the config info to scheduler, and enforce it there.

• New philosophy: allow running jobs in any WSL distro except those disallowed in the config

• Add plan class support for WSL and Docker app versions

• client: query the libc version of WSL distros and report it in scheduler requests. The plan class entry for a WSL app version can specify a min libc version.

• wsl_wrapper: add --min_libc_version cmdline arg (should match plan class spec)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 66 lines in your changes missing coverage. Please review.

Project coverage is 10.75%. Comparing base (26ce93e) to head (63ef5f1). Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
sched/plan_class_spec.cpp	0.00%	33 Missing :warning:
lib/wslinfo.cpp	0.00%	17 Missing :warning:
lib/util.cpp	0.00%	9 Missing :warning:
lib/cc_config.cpp	0.00%	5 Missing :warning:
sched/sched_types.cpp	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5865 +/- ## ============================================ - Coverage 10.76% 10.75% -0.02% Complexity 1068 1068 ============================================ Files 280 280 Lines 36493 36552 +59 Branches 8444 8471 +27 ============================================ Hits 3930 3930 - Misses 32174 32233 +59 Partials 389 389 ``` | [Files with missing lines](https://app.codecov.io/gh/BOINC/boinc/pull/5865?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC) | Coverage Δ | | |---|---|---| | [lib/cc\_config.h](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Fcc_config.h&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL2NjX2NvbmZpZy5o) | `0.00% <ø> (ø)` | | | [lib/util.h](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Futil.h&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL3V0aWwuaA==) | `40.00% <ø> (ø)` | | | [lib/wslinfo.h](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Fwslinfo.h&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL3dzbGluZm8uaA==) | `0.00% <ø> (ø)` | | | [sched/plan\_class\_spec.h](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=sched%2Fplan_class_spec.h&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-c2NoZWQvcGxhbl9jbGFzc19zcGVjLmg=) | `0.00% <ø> (ø)` | | | [sched/sched\_types.h](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=sched%2Fsched_types.h&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-c2NoZWQvc2NoZWRfdHlwZXMuaA==) | `0.00% <ø> (ø)` | | | [sched/sched\_types.cpp](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=sched%2Fsched_types.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-c2NoZWQvc2NoZWRfdHlwZXMuY3Bw) | `0.00% <0.00%> (ø)` | | | [lib/cc\_config.cpp](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Fcc_config.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL2NjX2NvbmZpZy5jcHA=) | `0.00% <0.00%> (ø)` | | | [lib/util.cpp](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Futil.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL3V0aWwuY3Bw) | `29.77% <0.00%> (-2.47%)` | :arrow_down: | | [lib/wslinfo.cpp](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=lib%2Fwslinfo.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-bGliL3dzbGluZm8uY3Bw) | `0.00% <0.00%> (ø)` | | | [sched/plan\_class\_spec.cpp](https://app.codecov.io/gh/BOINC/boinc/pull/5865?src=pr&el=tree&filepath=sched%2Fplan_class_spec.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BOINC#diff-c2NoZWQvcGxhbl9jbGFzc19zcGVjLmNwcA==) | `0.00% <0.00%> (ø)` | |