Description:

netctl profil "wireless-wpa" fail to start from `systemctl start netctl@wireless-wpa` because it's search for profil "wireless/wpa". same profil work with `netctl start wireless-wpa` or with systemctl renaming the profile.

Additional info:

* package version
systemd 202-2
netctl 0.8-1

* log
[with systemctl :]
May 01 12:40:44 localhost systemd[1]: Starting Networking for netctl profile wireless/wpa...
May 01 12:40:44 localhost network[1219]: Profile 'wireless/wpa' does not exist or is not readable
May 01 12:40:44 localhost systemd[1]: netctl@wireless-wpa.service: main process exited, code=exited, status=1/FAILURE
May 01 12:40:44 localhost systemd[1]: Failed to start Networking for netctl profile wireless/wpa.
May 01 12:40:44 localhost systemd[1]: MESSAGE=Unit netctl@wireless-wpa.service entered failed state.
May 01 12:41:02 localhost systemd[1]: Starting Networking for netctl profile wireless-wpa...
[with netctl :]
May 01 12:41:02 localhost network[1229]: Starting network profile 'wireless-wpa'...
May 01 12:41:02 localhost kernel: IPv6: ADDRCONF(NETDEV_UP): wlp1s0: link is not ready
May 01 12:41:04 localhost kernel: wlp1s0: authenticate with ...
May 01 12:41:04 localhost kernel: wlp1s0: send auth to ...(try 1/3)
May 01 12:41:04 localhost kernel: wlp1s0: authenticated
May 01 12:41:04 localhost kernel: ath9k 0000:01:00.0 wlp1s0: disabling HT as WMM/QoS is not supported by the AP
May 01 12:41:04 localhost kernel: ath9k 0000:01:00.0 wlp1s0: disabling VHT as WMM/QoS is not supported by the AP
May 01 12:41:04 localhost kernel: wlp1s0: associate with ... (try 1/3)
May 01 12:41:04 localhost kernel: wlp1s0: RX AssocResp from ... (capab=0x411 status=0 aid=2)
May 01 12:41:04 localhost kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlp1s0: link becomes ready
May 01 12:41:04 localhost kernel: wlp1s0: associated
May 01 12:41:04 localhost dhcpcd[1306]: version 5.6.7 starting
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: sending IPv6 Router Solicitation
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: sendmsg: Cannot assign requested address
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: broadcasting for a lease
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: offered ... from ...
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: acknowledged ... from ...
May 01 12:41:04 localhost dhcpcd[1306]: wlp1s0: checking for ...
May 01 12:41:08 localhost dhcpcd[1306]: wlp1s0: sending IPv6 Router Solicitation
May 01 12:41:09 localhost dhcpcd[1306]: wlp1s0: leased ... for 864000 seconds
May 01 12:41:10 localhost dhcpcd[1306]: forked to background, child pid 1397
May 01 12:41:10 localhost network[1229]: Started network profile 'wireless-wpa'
May 01 12:41:10 localhost systemd[1]: Started Networking for netctl profile wireless-wpa.

Steps to reproduce:
just start netctl from systemctl with profil containing a '-'

Severity:
according to systemd irc channel just renaming the profil is not good solution because this small bug sound to be something more deep.