SDL CLI 'remove' -command key search pattern

SDL CLI 'remove' -command key search pattern

Implement a key search pattern support for the sdlcli 'remove' -command.
With this command keys can be removed from SDL DB, removed keys can be
defined for the command either as key name or key search pattern
arguments. Command removes all the SDL DB keys by default, if key or key
search pattern argument is not given for the command.
Command syntax is:
  sdlcli remove <namespace> [<key|pattern>... <keyN|patternN>] [flags]

Issue-Id: RIC-113

Signed-off-by: Timo Tietavainen <timo.tietavainen@nokia.com>
Change-Id: I2cbe20a45aa21a15ee8a8b79abb7667b0307a93f