Check whether rtpproxy was already started/stopped before trying to start/stop respectively. Return success in case then requested action was already done (as stated in LSB).
Check whether rtpproxy was already started/stopped before trying to
start/stop respectively. Return success in case then requested
action was already done (as stated in LSB).

Signed-off-by: Peter Lemenkov <2f981fc861bda8c748898150c942841af4296212@gmail.com>

miconda/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,kiryu/rtpproxy,jevonearth/rtpproxy,jevonearth/rtpproxy,DrumTechnologiesLtd/rtpproxy,synety-jdebp/rtpproxy,Vocalocity/rtpproxy-pre,viraptor/RTPproxy,mab-netdev/rtpproxy,miconda/rtpproxy,hongbinz/rtpproxy,dsanders11/rtpproxy,jevonearth/rtpproxy,miconda/rtpproxy,gtkiller/rtpproxyd,kiryu/rtpproxy,hongbinz/rtpproxy,mab-netdev/rtpproxy,hongbinz/rtpproxy,sippy/rtpproxy,gtkiller/rtpproxyd,dsanders11/rtpproxy,Vocalocity/rtpproxy-pre,Vocalocity/rtpproxy-pre,sippy/rtpproxy,viraptor/RTPproxy,DrumTechnologiesLtd/rtpproxy,DrumTechnologiesLtd/rtpproxy,synety-jdebp/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,kiryu/rtpproxy,synety-jdebp/rtpproxy,mab-netdev/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy