[zos-files] upload_file_to_dsn does not convert Windows line endings

[t1m0thyj]

When uploading a file with Windows line endings, the \r\n line endings turn into double line endings.

The expected behavior is that (unless the file is uploaded in binary mode) the line endings would be converted to Unix (\n).

[t1m0thyj]

The following snippet can be used to test uploading/downloading a file for this issue (and #179).

from decouple import config
from zowe.zos_files_for_zowe_sdk import Files

profile = {
    "host": "<zosmfHost>",
    "port": 443,
    "rejectUnauthorized": True,
    "user": config("ZOWE_OPT_USER"),
    "password": config("ZOWE_OPT_PASSWORD")
}
dsname = "<testDsname>"
files_api = Files(profile)
files_api.upload_file_to_dsn("test-upload.txt", dsname)
files_api.download_dsn(dsname, "test-download.txt")

[t1m0thyj]

I think in order to fix this, we'll need to add a "binary" option to the upload_file_to_dsn method.

When this option is true, we can open the input file in rb mode and upload it without any processing.

When this option is false, we can open the file in r mode which will normalize new lines before uploading - according to the docs Python's default behavior is to replace \r\n with \n.

[adam-wolfe]

Fix implemented in #276