PowerShell/Win32-OpenSSH#1211PowerShell/Win32-OpenSSH#1082
Added support for posix_spawnp that executes the command directly instead of appending path. (SH_ASKPASS and proxy command use this). Refactored posix spawn commandline building logic to automatically account for Windows CRT escaping rules on all arguments.
1. Expand wildcard for input parameters
2. add scp tests with wildcard
3. for debug mode, need to enable the log to local log file.
4. update the path to log file
1. Add file permission check when load or add ssh_config, authorized_keys, private keys, host keys,.
2. set the owner and ACE for create secure file, ex, private key in ssh-keygen.exe
3. Update script OpenSSHTestHelper.psm1 to be able to run Install-OpenSSH if the sshd is running on the machine.
4. add OpenSSHBinPath to path.
5. change indents in agentconfig.c
6. update test script to represent the changes
7. Add tests for:
* authorized_keys and ssh-keygen testing
* host keys file perm testing
* user private key file perm testing
* ssh-add test
* user ssh_config
1. Reduce the console output of build
2. move to use powershell core 6.0.0.14
3. one minor fix in pester tests.
* Update the path of unittest results and build log. suppress the warning message.
* limitoutput of choco installation.
* fix of quotes
* remove redundant log
* Set x64 Release build as default
