[rnn lstm gru layer] Maintain rnn, lstm, gru layer property with props

[rnn lstm gru layer] Maintain rnn, lstm, gru layer property with props

 - All rnn, lstm, gru layer property will be maintain with props
 - Allow dropout to zero

**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: hyeonseok lee <hs89.lee@samsung.com>