Adds LinuxMetadata support by default on Windows

[jterry75]

1. Sets the LinuxMetadata flag by default on Windows LCOW v1
   MappedDirectories.

Signed-off-by: Justin Terry (VM) juterry@microsoft.com

- What I did
Added LinuxMetadata support for MappedDirectories on Windows LCOW v1.

- How I did it
RS4 added platform support for this in Windows. This adds the proper forwarding on these builds to enable it by default.

- How to verify it
Pre-Fix

> mkdir test
> echo test > test\test.log
> docker run -it -v <pwd>\test:/mnt/test alpine sh
/ # ls -al /mnt/test/test.log
-rwxrwxrwx    1 root     root             2 Jul 23 17:16 /mnt/test/test.log
/ # chmod 0700 /mnt/test/test.log
/ # ls -al /mnt/test/test.log
-rwxrwxrwx    1 root     root             2 Jul 23 17:16 /mnt/test/test.log
/ # exit
>

Post-Fix (notice the chmod bits changed at runtime)

> mkdir test
> echo test > test\test.log
> docker run -it -v <pwd>\test:/mnt/test alpine sh
/ # ls -al /mnt/test/test.log
-rwxrwxrwx    1 root     root             2 Jul 23 17:16 /mnt/test/test.log
/ # chmod 0700 /mnt/test/test.log
/ # ls -al /mnt/test/test.log
-rwx------    1 root     root             2 Jul 23 17:16 /mnt/test/test.log
/ # exit
>

And it persists across runs!

> docker run -it -v E:\docker\testshare:/mnt/test alpine sh
/ # ls -al /mnt/test/test.log
-rwx------    1 root     root             2 Jul 23 17:16 /mnt/test/test.log
/ # exit
>

- Description for the changelog

Adds LinuxMetadata support to all RS4+ LCOW v1 containers on Windows.

- A picture of a cute animal (not mandatory but encouraged)

[jterry75]

@jhowardmsft - FYI

[lowenna]

LGTM :)

[lowenna]

@rn @johnstep PTAL

[lowenna]

@thaJeztah You any concerns with this? PPC seems stuck pending

[codecov]

Codecov Report

Merging #37514 into master will increase coverage by 0.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #37514      +/-   ##
==========================================
+ Coverage   34.95%   35.44%   +0.49%     
==========================================
  Files         610      610              
  Lines       44886    44886              
==========================================
+ Hits        15690    15912     +222     
+ Misses      27077    26814     -263     
- Partials     2119     2160      +41

[thaJeztah]

LGTM, thanks!