Bug 1524640

Description of problem:
(1) when systemd-analyze is presented with wrong unitfile, it sometimes reports success even if there are errors making the unitfile work badly.

(2) Also, it shows results for files in current directory if not asked to. It doesn't reflect the tests status via EXITCODE in this case though.

Version-Release number of selected component (if applicable):
systemd-219-49.el7.x86_64

How reproducible:
always

Steps to Reproduce:
all invocations bellow show also results for adjacent unit files in CWD
do `systemd-analyze verify mysvc.service` and see (a)
 * exitcode is zero, failure on dependencies detected (syntax)
do `systemd-analyze verify user.slice` and see (b)
 * from example in manpage
 * fails obviously, with exitcode 1
do `systemd-analyze verify mysvc.service user.slice` and see (c)
 * fails with exitcode 1

Actual results:
(a) systemd-analyze verify mysvc.service; echo EC=$?
[/root/mytests/user.slice:2] Unknown lvalue 'WhatIsThis' in section 'Unit'
[/root/mytests/user.slice:6] Unknown section 'Service'. Ignoring.
[/usr/lib/systemd/system/ip6tables.service:3] Failed to add dependency on syslog.target,iptables.service, ignoring: Invalid argument
[/root/mytests/mysvc.service:2] Failed to add dependency on syslog.target,network.service, ignoring: Invalid argument
EC=0

(b) systemd-analyze verify user.slice; echo EC=$?
[/root/mytests/user.slice:2] Unknown lvalue 'WhatIsThis' in section 'Unit'
[/root/mytests/user.slice:6] Unknown section 'Service'. Ignoring.
[/usr/lib/systemd/system/ip6tables.service:3] Failed to add dependency on syslog.target,iptables.service, ignoring: Invalid argument
Error: org.freedesktop.systemd1.NoSuchUnit: Unit not found.
Failed to create user.slice/start: No such file or directory
user.slice: man nosuchfile(1) command failed with code 16
EC=1

(c) systemd-analyze verify user.slice mysvc.service; echo EC=$?
[/root/mytests/user.slice:2] Unknown lvalue 'WhatIsThis' in section 'Unit'
[/root/mytests/user.slice:6] Unknown section 'Service'. Ignoring.
[/usr/lib/systemd/system/ip6tables.service:3] Failed to add dependency on syslog.target,iptables.service, ignoring: Invalid argument
[/root/mytests/mysvc.service:2] Failed to add dependency on syslog.target,network.service, ignoring: Invalid argument
Error: org.freedesktop.systemd1.NoSuchUnit: Unit not found.
Failed to create user.slice/start: No such file or directory
user.slice: man nosuchfile(1) command failed with code 16
EC=1
Expected results:
non-zero exitcode in all scenarios above

Additional info:
>cat mysvc.service 
[Unit]
After=syslog.target,network.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/true
ExecStop=/usr/bin/true

[Install]
WantedBy=basic.target

>cat user.slice 
[Unit]
WhatIsThis=11
Documentation=man:nosuchfile(1)
Requires=different.service

[Service]
Desription=x