Update fcopy related cases for Check-FileInLinuxGuest command

[lixuemin2016]

Original Check-FileInLinuxGuest has bugs when migration from lis-test to lisav2.
Details update lists as below:

1. Separate check-size and check-content, before use sts[-1], sts[0], now change to sts
2. Before without return $False if file does not exist
3. Out-File $testfile -Encoding UTF8 to avoid mess code, before use dos2unix.
4. Add parse parmeter FilesSize
5. Fix Run-LinuxCmd without output for $sts if only use "rm -f file"
   $sts = Run-LinuxCmd -username $VMUserName -password $VMPassword -port $VMPort -ip $Ipv4 "rm -f /mnt/test/$testfile" -runAsSudo
6. Change "File is not present" as "File check error", since when file is empty, it will get file size 0, but the file is present.

Have run all the TestTag fcopy cases, all the cases are passed. Before update, FCOPY-REPEATED-DELETE and FCOPY-OVERWRITE failed.

Thank you so much.

[chvalean]

Small comments added, thank you for the improvements!

[chvalean]

if you add TestParams parsing directly to Main, then this section is no longer required.
Please check sample code here:
https://github.com/LIS/LISAv2/blob/master/Testscripts/Windows/SETUP-Remove-NVME-Disk.ps1#L48

[lixuemin2016]

Thank you for your guidance, new method is very convenient.

[lixuemin2016]

Add new changes here, maybe better put the new change to new commit.

1. Change some "Return "PASS"" location in the scripts, before it Return "Pass" before Remove-Item in server file.
2. Check Remove-Item -Path \$HVServer\ return value, use ($? -ne "True") to check remove successfully or not, even (- not $?) also can check, in order to keep consistent, use same style
3. Remove call trace check in the FCOPY-DISABLE-ENABLE case, since already cover by log checking in the framework.
4. FCOPY-NEGATIVE case also has some issues, will update it tomorrow.

[juhlee-microsoft]

@lixuemin2016 @chvalean please follow up the change if needed further discussion. Or, sign off please.