security/pecl-ssh2: Update to 1.0

[dbaio]

Summary

security/pecl-ssh2: Update to 1.0

- Create security/pecl-ssh2-0 
- Add UPDATING note

security/pecl-ssh2 (v1.0)  --> PHP 7 only. 
security/pecl-ssh2-0 (v0.13)  --> PHP 5 compatible.

Changes: https://pecl.php.net/package-changelog.php?package=ssh2&release=1.0

PR:		215378
Reported by:	Alexander Ushakov <[e-mail]>
Approved by:	garga (mentor)
Differential Revision:	https://reviews.freebsd.org/D10702

Test Plan

security/pecl-ssh2 $ portlint -C
looks fine.

security/pecl-ssh2-0 $ portlint -C
WARN: [...]/distinfo: [1]: TIMESTAMP is over 30 days old
0 fatal errors and 1 warning found.

poudriere testport:

# security/pecl-ssh2
DEFAULT_VERSIONS+=     php=7.0

10.3-RELEASE-p19 i386
10.3-RELEASE-p19 amd64
11.0-RELEASE-p10 i386
11.0-RELEASE-p10 amd64
12.0-CURRENT r318003 i386
12.0-CURRENT r318000 amd64

# security/pecl-ssh2-0

10.3-RELEASE-p19 i386
10.3-RELEASE-p19 amd64
11.0-RELEASE-p10 i386
11.0-RELEASE-p10 amd64
12.0-CURRENT r318003 i386
12.0-CURRENT r318000 amd64

[garga]

security/pecl-ssh2-0/Makefile

21 ↗

(On Diff #28293)

Do they conflict at build time? If not you could use CONFLICTS_INSTALL here

[dbaio]

Removing CONFLICTS part. Letting this with PHP.