sync: rework --jobs to provide better defaults

For --jobs-network, the logic is now:
* If the user specifies --jobs-network, use that.
* Else, if the user specifies --jobs, use that.
* Else, if the manifest specifies sync-j, use that.
* Else, default to 1.
Then we limit the jobs count based on the softlimit RLIMIT_NOFILE.

For --jobs-checkout, the logic is now:
* If the user specifies --jobs-checkout, use that.
* Else, if the user specifies --jobs, use that.
* Else, if the manifest specifies sync-j, use that.
* Else, default to DEFAULT_LOCAL_JOBS which is based on user's ncpus.
Then we limit the jobs count based on the softlimit RLIMIT_NOFILE.

For garbage collecting, the logic is now:
* If the user specifies --jobs, use that.
* Else, if the manifest specifies sync-j, use that.
* Else, default to the user's ncpus.
Then we limit the jobs count based on the softlimit RLIMIT_NOFILE.

Having to factor in the manifest settings makes this more complicated
which is why we delay processing of defaults until after we've synced
the manifest projects.

Bug: http://b/239712300
Change-Id: Id27cda63c76c156f1d63f6a20cb2c4ceeb3d547c
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/341394
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: LaMont Jones <lamontjones@google.com>

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