Syslog modules do not extract multi line log entries when the FILTER option is used

[theSha1chemist]

Issue

The following syslog modules:

• modules/dynamic/watch/syslog.py
• modules/dynamic/monitor/syslog.py

Do not capture multi line logs when the FILTER option is used.

(this is because grep -i is used for filtering)

Expected behaviour

If the filter option is used, multi line logs should be extracted. e.g. when using introspy

Actual behaviour

Only the first line of the log entry is extracted

Steps to reproduce

1. install the latest version of introspy https://github.com/integrity-sa/Introspy-iOS/releases
2. configure introspy to trace function calls in the iOS settings
3. on needle: use dynamic/watch/syslog
4. set FILTER 'target app'
5. only the first line of introspy's output will be printed

needle error logs

Ensure verbose and debug mode are enabled:
[needle][syslog] > run
[*] Checking connection with device...
[+] Already connected to: 192.168.0.103
[V] Creating temp folder: /var/root/needle/
[D] [REMOTE CMD] Remote Command: if [ -d /var/root/needle/ ]; then echo "yes"; else echo "no" ; fi
[+] Attaching to syslog (CTRL-C to quit)
[D] [REMOTE CMD] Remote Interactive TTY Command: ondeviceconsole | grep -i "DamnVulnerableIOSApp" | tee /var/root/needle/syslog
Warning: Permanently added '192.168.0.103' (RSA) to the list of known hosts.
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : ImageIO: PNG invalid PNG file: iDOT doesn't point to valid IDAT chunk
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : SecOSStatusWith error:[-34018] Error Domain=NSOSStatusErrorDomain Code=-34018 "client has neither application-identifier nor keychain-access-groups entitlements" UserInfo={NSDescription=client has neither application-identifier nor keychain-access-groups entitlements}
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:58 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:59 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:59 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:59 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:59 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----
Apr 13 12:33:59 iPhone DamnVulnerableIOSApp[11704] : -----INTROSPY-----