Release share v0.29.2 (2021-09-06)

===  Bug fixes

*  os/exec: fix escaped quote inside the same quote

   Shell quote is a hell of complex.  For example, one can write
   shell that execute command that contains quote of quote,

     sh -c "psql -c 'CREATE ... IDENTIFIED BY PASSWORD '\''pass'\'''"

   or to simplify,

     sh -c "psql -c \"CREATE ... IDENTIFIED BY PASSWORD 'pass'\""

*  lib/memfs: fix empty ContentType if MaxFileSize is negative

   A negative MaxFileSize means the content of file will not be mapped to
   memory, but the content type should be detected for other operation.

*  lib/memfs: fix empty file not being added to tree

   Previously, we did not check if the file size is 0 before reading the
   content or updating the content type, which cause the read on file
   return io.EOF and the file not added to caches.

   This commit fix this issue by checking for zero file size and for
   io.EOF when reading the file content.

*  lib/memfs: fix symbolic link with different name

   Previously, if file is symbolic link and has different name with their
   original file, it will return an error when we tried to open the file

      parentpath/filename: no such file or directory

   because we use the original file name, not the symlinked file name.

   This commit fix this issue by not replacing the original FileInfo for
   symlink but by setting only the size and mode.

*  lib/sql: do not run migration if the last file not exist on the list

   Previously, if the last migrated file name not found on the migration
   directory, we start executing migration start from the first file.

   This changes the behaviour to not run any migration at all.
   Since we cannot return it as an error, we only log it.  In the future
   we may return it.

*  lib/http: fix missing content type for XML Header

   If the Endpoint set the RequestType to RequestTypeXML, the response
   header should be set to ContentTypeXML.

*  lib/xmlrpc: fix missing port on NewClient

   Calling net.Dial or tls.Dial on host without port will cause the
   following error,

     NewClient: Dial: dial tcp: address 10.148.0.164: missing port in address

   This changes fix this by always generate new host value using previous
   host and port values.

*  lib/smtp: return io.EOF if no data received from server

   This is to prevent the recv return nil on *Response without an error,
   which may cause panic on caller side.

*  os/exec: check for escaped backslash when ParseCommandArgs

   Given the following string "cmd /a\ b" to ParseCommandArgs now
   return "cmd" and ["/a b"] not ["/a\", "b"], because the space after a
   is escaped using backslash.

===  Enhancements

*  lib/memfs: set default content type for empty file to "text/plain"

   An empty file should be able to be displayed as text file instead of
   downloaded as binary.

*  lib/memfs: change the MarshalJSON to always return an object

   Previously, MarshalJSON on memfs will return an object of map
   of all PathNodes and on Node it will return an object.

   This changes make it the JSON response consistent. If its directory
   it will return the node object with its childs, without "content".
   If its file, it will return the node object with content.

   While at it, use single "mod_time" with value is epoch and return
   the node ContentType as "content_type".

*  lib/mlog: implement io.Writer and add function ErrorWriter

   The ErrorWriter will return the internal default MultiLogger.
   A call to Write() on returned io.Writer will forward it to all registered
   error writers.

   A Write method on MultiLogger write the b to all error writers.
   It will always return the length of b without an error.

*  lib/memfs: add method Save and Encode

   The Save method will write the new content to file system and update
   the content of Node using Encode().

*  lib/ssh: add method to set session output and error

   Previously, all of the SSH output and error goes to os.Stdout and
   os.Stderr.

   This changes add method SetSessionOutputError to change the output and
   error for future remote execution.

===  Chores

*  lib/reflect: make the IsNil tests to become an example

   In this way we do test and provide an example at the same time.

   While at it, add another test cases for boolean, initialized slice, map,
   and errors.

*  lib/websocket: try to fix flaky test on client

   The following error thrown when running on Github Action using
   Ubuntu-latest and Go 1.16.3,

     client_test.go:472: write tcp 127.0.0.1:34460->127.0.0.1:9001:
       write: connection reset by peer

   This may be caused by using the same client connection on all test
   cases.

   We try to fix this by creating new client on each test cases.
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